Gary, Your logic is incorrect. SPF is a check made by the destination mail server (possibly my mail server) against the sending mail server (your mail server). Your users authenticate to your mail server, then submit a message to your mail server for delivery by your mail server to the remote mail server. So, the remote mail server (possibly my mail server) would check the SPF to determine if your mail server was listed as a source for the domain of the sending email address.
Michael Thomas Mathbox 978-683-6718 1-877-MATHBOX (Toll Free) > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Gary Steiner > Sent: Friday, February 16, 2007 2:56 PM > To: declude.junkmail@declude.com > Subject: SPAM-WARN:Re: [Declude.JunkMail] OT: SPF record question > > I have a question to follow this subject. If users have > Outlook and they are sending email fromm home or whereever > using authentication, then the IP that shows up in the header > will be their home connection. That being the case, unless > your users are strictly using webmail, your SPF record should > show no enforcement otherwise all the non-webmail messages > will get blocked. To me this indicates that SPF doesn't help > you if your users are not using webmail. Is this correct? > > Gary > > > > -------- Original Message -------- > > From: "Darin Cox" <[EMAIL PROTECTED]> > > Sent: Wednesday, February 07, 2007 4:33 PM > > To: declude.junkmail@declude.com > > Subject: Re: [Declude.JunkMail] OT: SPF record question > > > > If your MX and A records are also in the 216.15.92.0/25 > network, then you > > don't need to specify the "a" and "mx" parameters, so you > could simplify to > > > > No enforcement, other hosts may send mail for the domain > > "v=spf1 ip4:216.15.92.0/25 ?all" > > > > Soft fail if policy violated. Filters may or may not block > on soft fail. > > "v=spf1 ip4:216.15.92.0/25 ~all" > > > > > > Hard fail if policy violated. Filters should block on hard fail. > > "v=spf1 ip4:216.15.92.0/25 -all" > > > > However, if you send from an MX or A record (web server) > that is not in the > > 216.15.92.0/25 subnet then you may need those. > > > > If you use a soft or hard fail policy, it's very important > that you identify > > _all_ sources of outbound mail for the domain, including > all mail servers, > > marketing mail engines, webservers, external hosts, etc. > Otherwise you're > > liable to have mail blocked as a result of your policy. > I've see this > > happen with a number of larger organizations, where they > have forgotten web > > servers with form-to-mail functions, marketing personnel sending out > > newsletters, or mobile users using ISP SMTP servers. > > > > Regarding your last three records, do you have subdomains > with MX records > > for direct.commarts.com, mail.commarts.com, and > smtp.commarts.com? I.e. do > > you receive mail to @direct.commarts.com, @mail.commarts.com, and > > @smtp.commarts.com addresses? If not, you don't need those records. > > > > Hope this helps, > > > > Darin. > > > > > > ----- Original Message ----- > > From: "Michael Hoyt" <[EMAIL PROTECTED]> > > To: "Declude JunkMail @declude.com" <Declude.JunkMail@declude.com> > > Sent: Wednesday, February 07, 2007 2:30 PM > > Subject: [Declude.JunkMail] OT: SPF record question > > > > > > Sorry for the re-posting but I forgot to add a Subject. > > > > I am finally getting my SPF records up but would like some > comments on > > whether I got it right. > > > > I would like to be able to send email from any IP address in my > > 216.15.92.0/25 network. Currently I have MX records for > mail.commarts.com > > (216.15.92.3) which is the only mail server that receives mail and > > direct.commarts.com (216.15.92.15) and smtp.commarts.com > (216.15.92.13). > > > > Using the Wizard at openspf.org I generated the following > SPF records: > > > > commarts.com. IN TXT "v=spf1 ip4:216.15.92.0/25 a mx ~all" > > direct.commarts.com. IN TXT "v=spf1 a -all" > > mail.commarts.com. IN TXT "v=spf1 a -all" > > smtp.commarts.com. IN TXT "v=spf1 a -all" > > > > After reading page 15 of the Whitepaper pertaining to the > ~all,-all or ?all > > part of the text in the first record my question is: If I > know that ALL > > email from my domain will originate from 216.15.92.0/25 > should the text be > > -all and not ~all? > > > > And my last question is are the three txt records > mentioning my MX servers > > necessary if I have 216.15.92.0/25 in the first record? > > > > Thank you in advance for any insight. > > > > -- > > Michael Hoyt > > > > > > Web Site: http://www.commarts.com > > > > > > > > > > > > --- > > This E-mail came from the Declude.JunkMail mailing list. To > > unsubscribe, just send an E-mail to [EMAIL PROTECTED], and > > type "unsubscribe Declude.JunkMail". The archives can be found > > at http://www.mail-archive.com. > > > > > > > > > > --- > > This E-mail came from the Declude.JunkMail mailing list. To > > unsubscribe, just send an E-mail to [EMAIL PROTECTED], and > > type "unsubscribe Declude.JunkMail". The archives can be found > > at http://www.mail-archive.com. > > > > > > --- > This E-mail came from the Declude.JunkMail mailing list. To > unsubscribe, just send an E-mail to [EMAIL PROTECTED], and > type "unsubscribe Declude.JunkMail". The archives can be found > at http://www.mail-archive.com. > > --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
