[cfaussie] RE: RegEx for email checking
Taco There is not point really All you can do is check that it has an @ symbol and a .something In the end, I could meet the criteria for the check, but then just enter in a bodgy address anyway Regards Steve Onnis Domain Concept Designs +61 422 337 685 +61 3 9431 4249 http://www.domainconceptdesigns.com http://www.domainconceptdesigns.com/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.cfcentral.com.au http://www.cfcentral.com.au/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] (If you think it can't be done, you haven't asked me!) - Steve Onnis -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Taco Fleur Sent: Tuesday, January 21, 2003 9:15 PM To: CFAussie Mailing List Subject: [cfaussie] RegEx for email checking Just wondering! Has anyone out there managed to create a watertight regEx for checking and validating email addresses? I found a few out there, but once you put them under the microscope you find that they all seem to be missing something here and there. And also, has anyone got any idea where I can find the specifications for an email address, i.e. a document that explains what the max. min. chars are, what it can and can't contain etc.? I had a look at www.w3c.org but no luck If not, is there anyone interested in creating one as a team effort? I have some regEx examples that I have broken down and noted the questions and missing code, but my regEx is a bit rusty lately and besides I want to make sure it's a 1000% watertight check. not letting anyone get away with mistakes but also not denying anyone with a valid address... TIA Taco Fleur --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ --- You are currently subscribed to cfaussie as: archive@mail-archive.com To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/
[cfaussie] RE: RegEx for email checking
Hi Steve, Correct me if I am wrong, but there are a lot more things you can check for with regEx, for example; - If it has a @ sign and only one - If the first part of the email has more than X characters, and less than X characters - If the first part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email more than X characters, and less than X characters - If the second part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email contains at least one dot and no more than one Etc. Etc. there are many more things you can check for, since I have not found any concrete and accurate info of what an email can consist of I am a bit stuck.. Taco Fleur Original Message From: Steve Onnis [EMAIL PROTECTED] Apparently from: [EMAIL PROTECTED] To: CFAussie Mailing List [EMAIL PROTECTED] Subject: [cfaussie] RE: RegEx for email checking Date: Tue, 21 Jan 2003 22:09:33 +1100 Taco There is not point really All you can do is check that it has an @ symbol and a .something In the end, I could meet the criteria for the check, but then just enter in a bodgy address anyway Regards Steve Onnis Domain Concept Designs +61 422 337 685 +61 3 9431 4249 http://www.domainconceptdesigns.com http://www.domainconceptdesigns.com/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.cfcentral.com.au http://www.cfcentral.com.au/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] (If you think it can't be done, you haven't asked me!) - Steve Onnis -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Taco Fleur Sent: Tuesday, January 21, 2003 9:15 PM To: CFAussie Mailing List Subject: [cfaussie] RegEx for email checking Just wondering! Has anyone out there managed to create a watertight regEx for checking and validating email addresses? I found a few out there, but once you put them under the microscope you find that they all seem to be missing something here and there. And also, has anyone got any idea where I can find the specifications for an email address, i.e. a document that explains what the max. min. chars are, what it can and can't contain etc.? I had a look at www.w3c.org but no luck If not, is there anyone interested in creating one as a team effort? I have some regEx examples that I have broken down and noted the questions and missing code, but my regEx is a bit rusty lately and besides I want to make sure it's a 1000% watertight check. not letting anyone get away with mistakes but also not denying anyone with a valid address... TIA Taco Fleur --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ --- You are currently subscribed to cfaussie as: archive@mail-archive.com To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/
[cfaussie] RE: RegEx for email checking
Attached is a javascript that I use to check... If you can't see the attachment, then you can grab it at http://r3v3ng.net/scripts/email_check.js Implimentation test : http://r3v3ng.net/scripts/email_test.html -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Taco Fleur Sent: Tuesday, 21 January 2003 9:15 PM To: CFAussie Mailing List Subject: [cfaussie] RegEx for email checking Just wondering! Has anyone out there managed to create a watertight regEx for checking and validating email addresses? I found a few out there, but once you put them under the microscope you find that they all seem to be missing something here and there. And also, has anyone got any idea where I can find the specifications for an email address, i.e. a document that explains what the max. min. chars are, what it can and can't contain etc.? I had a look at www.w3c.org but no luck If not, is there anyone interested in creating one as a team effort? I have some regEx examples that I have broken down and noted the questions and missing code, but my regEx is a bit rusty lately and besides I want to make sure it's a 1000% watertight check. not letting anyone get away with mistakes but also not denying anyone with a valid address... TIA Taco Fleur --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ email_check.js Description: Binary data --- You are currently subscribed to cfaussie as: archive@mail-archive.com To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/
[cfaussie] RE: RegEx for email checking
if you're looking for 'official' specs for internet stuff, go straight to the horrses mouth: http://www.faqs.org/rfcs For email addressing, try starting with rfc-822: http://www.faqs.org/rfcs/rfc822.html cheers. +--+ | Turn on your Revenue Stream... | | Bolt on a Virtual Cash Register to your e-commerce site now. | | VeriPay from Xilo Online: http://www.xilo.com/veripay| +--+ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Taco Fleur Sent: Tuesday, 21 January 2003 9:15 PM To: CFAussie Mailing List Subject: [cfaussie] RegEx for email checking Just wondering! Has anyone out there managed to create a watertight regEx for checking and validating email addresses? I found a few out there, but once you put them under the microscope you find that they all seem to be missing something here and there. And also, has anyone got any idea where I can find the specifications for an email address, i.e. a document that explains what the max. min. chars are, what it can and can't contain etc.? I had a look at www.w3c.org but no luck If not, is there anyone interested in creating one as a team effort? I have some regEx examples that I have broken down and noted the questions and missing code, but my regEx is a bit rusty lately and besides I want to make sure it's a 1000% watertight check. not letting anyone get away with mistakes but also not denying anyone with a valid address... TIA Taco Fleur --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ --- You are currently subscribed to cfaussie as: archive@mail-archive.com To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/
[cfaussie] RE: RegEx for email checking
Yeah but once you fullfill those requirements, whats to say that it is actually a valid email address? [EMAIL PROTECTED] this would pass any email validater, but one would safly say that the email address is a crap one thats what I mean All you can do is check that its formatted properly, but as for if is a valid email address and the account exists, well good luck. I have added into my validation scripts to do a post to the actual domain used in the address and then check the response that you get back, IE if you get a Connection Failure response, then there is no way the address is valid, but then I cam across mail servers not using standard ports ect. Regards Steve Onnis Domain Concept Designs +61 422 337 685 +61 3 9431 4249 http://www.domainconceptdesigns.com http://www.domainconceptdesigns.com/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.cfcentral.com.au http://www.cfcentral.com.au/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] (If you think it can't be done, you haven't asked me!) - Steve Onnis -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, January 21, 2003 10:17 PM To: CFAussie Mailing List Subject: [cfaussie] RE: RegEx for email checking Hi Steve, Correct me if I am wrong, but there are a lot more things you can check for with regEx, for example; - If it has a @ sign and only one - If the first part of the email has more than X characters, and less than X characters - If the first part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email more than X characters, and less than X characters - If the second part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email contains at least one dot and no more than one Etc. Etc. there are many more things you can check for, since I have not found any concrete and accurate info of what an email can consist of I am a bit stuck.. Taco Fleur Original Message From: Steve Onnis [EMAIL PROTECTED] Apparently from: [EMAIL PROTECTED] To: CFAussie Mailing List [EMAIL PROTECTED] Subject: [cfaussie] RE: RegEx for email checking Date: Tue, 21 Jan 2003 22:09:33 +1100 Taco There is not point really All you can do is check that it has an @ symbol and a .something In the end, I could meet the criteria for the check, but then just enter in a bodgy address anyway Regards Steve Onnis Domain Concept Designs +61 422 337 685 +61 3 9431 4249 http://www.domainconceptdesigns.com http://www.domainconceptdesigns.com/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.cfcentral.com.au http://www.cfcentral.com.au/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] (If you think it can't be done, you haven't asked me!) - Steve Onnis -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Taco Fleur Sent: Tuesday, January 21, 2003 9:15 PM To: CFAussie Mailing List Subject: [cfaussie] RegEx for email checking Just wondering! Has anyone out there managed to create a watertight regEx for checking and validating email addresses? I found a few out there, but once you put them under the microscope you find that they all seem to be missing something here and there. And also, has anyone got any idea where I can find the specifications for an email address, i.e. a document that explains what the max. min. chars are, what it can and can't contain etc.? I had a look at www.w3c.org but no luck If not, is there anyone interested in creating one as a team effort? I have some regEx examples that I have broken down and noted the questions and missing code, but my regEx is a bit rusty lately and besides I want to make sure it's a 1000% watertight check. not letting anyone get away with mistakes but also not denying anyone with a valid address... TIA Taco Fleur --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ --- You are currently subscribed to cfaussie as: archive@mail-archive.com To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/
[cfaussie] RE: RegEx for email checking
In that case you are right, there really is nothing you can do that proofs the email is existing, only send an email and see if its real and doesn't bounce back. you could try FINGER user@host but thats not running everywhere, you could PING the host, but thats also disabled on most hosts now. You could check if the domains is really registered, but it's all going a bit to far. I was actually not refering to the above routine either, I was just interested in checking if it's correctly formatted, for security purposes (hacking) and just to disallow bogus people signing up quickly. Thanks for the JS script by the way Bryan Nolen... Taco Fleur Yeah but once you fullfill those requirements, whats to say that it is actually a valid email address? [EMAIL PROTECTED] this would pass any email validater, but one would safly say that the email address is a crap one thats what I mean All you can do is check that its formatted properly, but as for if is a valid email address and the account exists, well good luck. I have added into my validation scripts to do a post to the actual domain used in the address and then check the response that you get back, IE if you get a Connection Failure response, then there is no way the address is valid, but then I cam across mail servers not using standard ports ect. Regards Steve Onnis Domain Concept Designs +61 422 337 685 +61 3 9431 4249 http://www.domainconceptdesigns.com http://www.domainconceptdesigns.com/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.cfcentral.com.au http://www.cfcentral.com.au/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] (If you think it can't be done, you haven't asked me!) - Steve Onnis -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, January 21, 2003 10:17 PM To: CFAussie Mailing List Subject: [cfaussie] RE: RegEx for email checking Hi Steve, Correct me if I am wrong, but there are a lot more things you can check for with regEx, for example; - If it has a @ sign and only one - If the first part of the email has more than X characters, and less than X characters - If the first part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email more than X characters, and less than X characters - If the second part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email contains at least one dot and no more than one Etc. Etc. there are many more things you can check for, since I have not found any concrete and accurate info of what an email can consist of I am a bit stuck.. Taco Fleur Original Message From: Steve Onnis [EMAIL PROTECTED] Apparently from: [EMAIL PROTECTED] To: CFAussie Mailing List [EMAIL PROTECTED] Subject: [cfaussie] RE: RegEx for email checking Date: Tue, 21 Jan 2003 22:09:33 +1100 Taco There is not point really All you can do is check that it has an @ symbol and a .something In the end, I could meet the criteria for the check, but then just enter in a bodgy address anyway Regards Steve Onnis Domain Concept Designs +61 422 337 685 +61 3 9431 4249 http://www.domainconceptdesigns.com http://www.domainconceptdesigns.com/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.cfcentral.com.au http://www.cfcentral.com.au/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] (If you think it can't be done, you haven't asked me!) - Steve Onnis -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Taco Fleur Sent: Tuesday, January 21, 2003 9:15 PM To: CFAussie Mailing List Subject: [cfaussie] RegEx for email checking Just wondering! Has anyone out there managed to create a watertight regEx for checking and validating email addresses? I found a few out there, but once you put them under the microscope you find that they all seem to be missing something here and there. And also, has anyone got any idea where I can find the specifications for an email address, i.e. a document that explains what the max. min. chars are, what it can and can't contain etc.? I had a look at www.w3c.org but no luck If not, is there anyone interested in creating one as a team effort? I have some regEx examples that I have broken down and noted the questions and missing code, but my regEx is a bit rusty lately and besides I want to make sure it's a 1000% watertight check. not letting anyone get away with mistakes but also not denying anyone with a valid address... TIA Taco Fleur --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send
[cfaussie] RE: RegEx for email checking
Maybe you can use some webservices to ask the email server to validate it for you. http://www.serviceobjects.com/products/dots_email.asp?bhcp=1 http://www.cdyne.com/web-services.aspx?flash=1 I never used them though. Laurent Fontaine Sr Web Developer American Power Conversion Level 13, 65 Berry Street North Sydney, NSW 2060 AUSTRALIA tel: +61 2 8923 9339 @: [EMAIL PROTECTED] [EMAIL PROTECTED] Sent by: To: CFAussie Mailing List [EMAIL PROTECTED] [EMAIL PROTECTED] cc: emon.com.au Subject: [cfaussie] RE: RegEx for email checking 22/01/2003 07:28 AM Please respond to CFAussie Mailing List In that case you are right, there really is nothing you can do that proofs the email is existing, only send an email and see if its real and doesn't bounce back. you could try FINGER user@host but thats not running everywhere, you could PING the host, but thats also disabled on most hosts now. You could check if the domains is really registered, but it's all going a bit to far. I was actually not refering to the above routine either, I was just interested in checking if it's correctly formatted, for security purposes (hacking) and just to disallow bogus people signing up quickly. Thanks for the JS script by the way Bryan Nolen... Taco Fleur Yeah but once you fullfill those requirements, whats to say that it is actually a valid email address? [EMAIL PROTECTED] this would pass any email validater, but one would safly say that the email address is a crap one thats what I mean All you can do is check that its formatted properly, but as for if is a valid email address and the account exists, well good luck. I have added into my validation scripts to do a post to the actual domain used in the address and then check the response that you get back, IE if you get a Connection Failure response, then there is no way the address is valid, but then I cam across mail servers not using standard ports ect. Regards Steve Onnis Domain Concept Designs +61 422 337 685 +61 3 9431 4249 http://www.domainconceptdesigns.com http://www.domainconceptdesigns.com/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.cfcentral.com.au http://www.cfcentral.com.au/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] (If you think it can't be done, you haven't asked me!) - Steve Onnis -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, January 21, 2003 10:17 PM To: CFAussie Mailing List Subject: [cfaussie] RE: RegEx for email checking Hi Steve, Correct me if I am wrong, but there are a lot more things you can check for with regEx, for example; - If it has a @ sign and only one - If the first part of the email has more than X characters, and less than X characters - If the first part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email more than X characters, and less than X characters - If the second part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email contains at least one dot and no more than one
[cfaussie] RE: RegEx for email checking
Cheers for that. Maybe you can use some webservices to ask the email server to validate it for you. http://www.serviceobjects.com/products/dots_email.asp?bhcp=1 http://www.cdyne.com/web-services.aspx?flash=1 I never used them though. Laurent Fontaine Sr Web Developer American Power Conversion Level 13, 65 Berry Street North Sydney, NSW 2060 AUSTRALIA tel: +61 2 8923 9339 @: [EMAIL PROTECTED] [EMAIL PROTECTED] Sent by: To: CFAussie Mailing List [EMAIL PROTECTED] [EMAIL PROTECTED] cc: emon.com.au Subject: [cfaussie] RE: RegEx for email checking 22/01/2003 07:28 AM Please respond to CFAussie Mailing List In that case you are right, there really is nothing you can do that proofs the email is existing, only send an email and see if its real and doesn't bounce back. you could try FINGER user@host but thats not running everywhere, you could PING the host, but thats also disabled on most hosts now. You could check if the domains is really registered, but it's all going a bit to far. I was actually not refering to the above routine either, I was just interested in checking if it's correctly formatted, for security purposes (hacking) and just to disallow bogus people signing up quickly. Thanks for the JS script by the way Bryan Nolen... Taco Fleur Yeah but once you fullfill those requirements, whats to say that it is actually a valid email address? [EMAIL PROTECTED] this would pass any email validater, but one would safly say that the email address is a crap one thats what I mean All you can do is check that its formatted properly, but as for if is a valid email address and the account exists, well good luck. I have added into my validation scripts to do a post to the actual domain used in the address and then check the response that you get back, IE if you get a Connection Failure response, then there is no way the address is valid, but then I cam across mail servers not using standard ports ect. Regards Steve Onnis Domain Concept Designs +61 422 337 685 +61 3 9431 4249 http://www.domainconceptdesigns.com http://www.domainconceptdesigns.com/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.cfcentral.com.au http://www.cfcentral.com.au/ [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] (If you think it can't be done, you haven't asked me!) - Steve Onnis -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, January 21, 2003 10:17 PM To: CFAussie Mailing List Subject: [cfaussie] RE: RegEx for email checking Hi Steve, Correct me if I am wrong, but there are a lot more things you can check for with regEx, for example; - If it has a @ sign and only one - If the first part of the email has more than X characters, and less than X characters - If the first part of the email contains only letters, numbers, underscore or hyphen etc. - If the second part of the email more than X characters, and less than X characters - If the second part of the email
[cfaussie] RE: RegEx for email checking
I just wanted to comment on my own message, regarding the checking of email for existence.. I just remembered that it is possible to perform a session via telnet to the mailserver checking if it will accept any messages to the email in question. --- You are currently subscribed to cfaussie as: archive@mail-archive.com To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/
[cfaussie] RE: RegEx for email checking
This email is to be read subject to the disclaimer below. Yes, and you can use nslookup or similar to find the MX record for the domain (which is a special type of DNS record listing the mail servers for a domain). Then you could telnet to each listed mail server. But I think that if something goes wrong and you get complaints from your users, you would have a rather tough time figuring out where your verification procedure went wrong. The method of emailing people a random password or token and requiring them to enter it is IMHO a much safer way of verifying not only the validity of an email address, but that the person signing up actually has access to it. Also the 'resolve host and then telnet' approach feels a bit like shooting mozzies with anti-aircraft artillery... Viktor Radnai Web Developer, National E-Commerce, Ernst Young Direct: +61 2 9248 4361 Taco Fleur [EMAIL PROTECTED] To: CFAussie Mailing List [EMAIL PROTECTED] Sent by: cc: [EMAIL PROTECTED]Subject: [cfaussie] RE: RegEx for email checking mon.com.au 22/01/2003 10:19 AM Please respond to CFAussie Mailing List I just wanted to comment on my own message, regarding the checking of email for existence.. I just remembered that it is possible to perform a session via telnet to the mailserver checking if it will accept any messages to the email in question. --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ NOTICE - This communication contains information which is confidential and the copyright of Ernst Young or a third party. If you are not the intended recipient of this communication please delete and destroy all copies and telephone Ernst Young on 1800 655 717 immediately. If you are the intended recipient of this communication you should not copy, disclose or distribute this communication without the authority of Ernst Young. Any views expressed in this Communication are those of the individual sender, except where the sender specifically states them to be the views of Ernst Young. Except as required at law, Ernst Young does not represent, warrant and/or guarantee that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. Liability limited by the Accountants Scheme, approved under the Professional Standards Act 1994 (NSW) --- You are currently subscribed to cfaussie as: archive@mail-archive.com To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/
[cfaussie] RE: RegEx for email checking
Yes I beleive you are right, in most cases it will be the best solution to send an email with the password. Actually my initial discussion was not based on checking if the email exists or not, but it became a topic. I just wanted to correct myself. PS. If you would do it via telnet it would be better to do it the following way; telnet to host on port 25 HELO [domain name] MAIL FROM [email address] Which would return 220 www.safe-mail.net ESMTP Exim 3.22 #1 Tue, 21 Jan 2003 18:40:39 -0500 250 www.safe-mail.net Hello host [x.x.x.x] MAIL FROM: [EMAIL PROTECTED] 250 [EMAIL PROTECTED] is syntactically correct Yes, and you can use nslookup or similar to find the MX record for the domain (which is a special type of DNS record listing the mail servers for a domain). Then you could telnet to each listed mail server. But I think that if something goes wrong and you get complaints from your users, you would have a rather tough time figuring out where your verification procedure went wrong. The method of emailing people a random password or token and requiring them to enter it is IMHO a much safer way of verifying not only the validity of an email address, but that the person signing up actually has access to it. Also the 'resolve host and then telnet' approach feels a bit like shooting mozzies with anti-aircraft artillery... Viktor Radnai Web Developer, National E-Commerce, Ernst Young Direct: +61 2 9248 4361 Taco Fleur [EMAIL PROTECTED] To: CFAussie Mailing List [EMAIL PROTECTED] Sent by: cc: [EMAIL PROTECTED]Subject: [cfaussie] RE: RegEx for email checking mon.com.au 22/01/2003 10:19 AM Please respond to CFAussie Mailing List I just wanted to comment on my own message, regarding the checking of email for existence.. I just remembered that it is possible to perform a session via telnet to the mailserver checking if it will accept any messages to the email in question. --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ NOTICE - This communication contains information which is confidential and the copyright of Ernst Young or a third party. If you are not the intended recipient of this communication please delete and destroy all copies and telephone Ernst Young on 1800 655 717 immediately. If you are the intended recipient of this communication you should not copy, disclose or distribute this communication without the authority of Ernst Young. Any views expressed in this Communication are those of the individual sender, except where the sender specifically states them to be the views of Ernst Young. Except as required at law, Ernst Young does not represent, warrant and/or guarantee that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. Liability limited by the Accountants Scheme, approved under the Professional Standards Act 1994 (NSW) --- You are currently subscribed to cfaussie as: archive@mail-archive.com To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/
[cfaussie] Re: RegEx for email checking
[EMAIL PROTECTED] resolves by every test, even vrfy recpient checks appear return the standard results from a locked down mail server. Email: [EMAIL PROTECTED] User: b.gates Domain: microsoft.com MX 10 = mailb.microsoft.com [131.107.3.123] - 220 inet-imc-03.redmond.corp.microsoft.com Microsoft.com ESMTP Server Tue, 21 Jan 2003 18:10:05 -0800 - HELO localhost - 250 inet-imc-03.redmond.corp.microsoft.com Hello [127.0.0.1] - MAIL FROM:[EMAIL PROTECTED] - 250 2.1.0 [EMAIL PROTECTED] OK - VRFY b.gates - 252 2.1.5 Cannot VRFY user, but will take message for [EMAIL PROTECTED] - VRFY [EMAIL PROTECTED] - 252 2.1.5 Cannot VRFY user, but will take message for [EMAIL PROTECTED] - RCPT TO:[EMAIL PROTECTED] - 250 2.1.5 [EMAIL PROTECTED] - RSET - 250 2.0.0 Resetting - QUIT - 221 2.0.0 inet-imc-03.redmond.corp.microsoft.com Service closing transmission channel Any server side testing of an email adress is imho pointless. Email a password for general but b.gates@microsoft ain't my address. and IU'd probably be willing to put money on the fact that any address translating however approximately to bubba gates at a microsoft domain isn't checked except once every six months for new funny hate mail to foward around the office. I also have a couple of addresses that would violate most extremely retentive verification. I've got a couple of blahlah.blahblah.com email addresses. And one blahblah.blahblah.blahblah.com not to mention the .com.au style addresses. I've also got one that I use fairly regularly as an anti spam defence with 40 or 50 characters before the @ and very few of my mail addressess can be pinged, vrfy'd or otherwise existence checked. Spammers have to work to qualify my addresses ; I generally either email passwords to my users if I need to verify the address, or treat any adress recieved as suspect and probably invalid. [EMAIL PROTECTED] wrote in message news:22138@cfaussie... Yes I beleive you are right, in most cases it will be the best solution to send an email with the password. Actually my initial discussion was not based on checking if the email exists or not, but it became a topic. I just wanted to correct myself. PS. If you would do it via telnet it would be better to do it the following way; telnet to host on port 25 HELO [domain name] MAIL FROM [email address] Which would return 220 www.safe-mail.net ESMTP Exim 3.22 #1 Tue, 21 Jan 2003 18:40:39 -0500 250 www.safe-mail.net Hello host [x.x.x.x] MAIL FROM: [EMAIL PROTECTED] 250 [EMAIL PROTECTED] is syntactically correct Yes, and you can use nslookup or similar to find the MX record for the domain (which is a special type of DNS record listing the mail servers for a domain). Then you could telnet to each listed mail server. But I think that if something goes wrong and you get complaints from your users, you would have a rather tough time figuring out where your verification procedure went wrong. The method of emailing people a random password or token and requiring them to enter it is IMHO a much safer way of verifying not only the validity of an email address, but that the person signing up actually has access to it. Also the 'resolve host and then telnet' approach feels a bit like shooting mozzies with anti-aircraft artillery... Viktor Radnai Web Developer, National E-Commerce, Ernst Young Direct: +61 2 9248 4361 Taco Fleur [EMAIL PROTECTED] To: CFAussie Mailing List [EMAIL PROTECTED] Sent by: cc: [EMAIL PROTECTED]Subject: [cfaussie] RE: RegEx for email checking mon.com.au 22/01/2003 10:19 AM Please respond to CFAussie Mailing List I just wanted to comment on my own message, regarding the checking of email for existence.. I just remembered that it is possible to perform a session via telnet to the mailserver checking if it will accept any messages to the email in question. --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MX Downunder AsiaPac DevCon - http://mxdu.com/ NOTICE - This communication contains information which is confidential and the copyright of Ernst Young or a third party. If you are not the intended recipient of this communication please delete and destroy all copies and telephone Ernst Young on 1800 655 717 immediately. If you are the intended recipient of this communication you should not copy, disclose or distribute this communication without the authority of Ernst Young. Any views expressed in this Communication are those of the individual sender, except where the sender specifically states them to be the views of Ernst Young. Except as required at law, Ernst Young
