Re: [courier-users] multiply mail-addresses problem
Martin Orr wrote: On 05/12/06 11:12, Anton Basistov wrote: Ok. I'll ask from another side. Can I configure Courier not to tell me about the wrong addresses? Even if my mail client very bad? I did this once, using a localmailfilter, I too but I forget the details. I didn't :-) It is something like: Create a catch-all alias whose .courier file bounces messages. That is a .courier-default in aliasdir. I configure it to dynamically call a script, e.g. `|| /etc/courier/aliasdir/rcptfilter.sh' or whatever. The script can either output the real destination address or refuse the mail, thereby causing a bounce to be generated. Write a localmailfilter which rejects a recipient if they are mapped to the catch-all alias and the client IP address is not equal to the one with the bad mail client, and accepts it otherwise. This can be done better using the same script called on delivery. When called as a whitelist filter, the script can decide for an on-line refusal (SMTP error) rather than a bounce. I posted on this subject on Fri, 27 Oct 2006 20:53:29 +0200, see e.g. http://groups.google.it/group/mailing.unix.courier-imap/browse_frm/thread/372a9a716cc333d0/d16bb37e01dfbe8e - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] multiply mail-addresses problem
Gordon Messmer wrote: Ok. I'll ask from another side. Can I configure Courier not to tell me about the wrong addresses? Even if my mail client very bad? Yes, it can, but not selectively. That is, if you want courier to be quiet about bad addresses, and bounce them, it will behave that way for your users and also for the internet at large. What will then happen is spammers will attempt dictionary attacks against your mail server to get valid addresses, and will generate all positives. They'll then send huge volumes of spam to your server, which courier would accept and then try to bounce. The spam would have a bad return address, and then sit undeliverable in your mail queue for a very long time before bouncing to the postmaster. The end result is that you can't read postmaster mail because there are too many messages, and you can't determine whether or not there's any valid problems with your mail server. The problem increases until your mail queue is full of thousands of messages which can't be delivered, and legitimate service degrades until it's not usable any more. Don't go down that road. It sucks. Ok, thank you very much! I understand now. Anton. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] multiply mail-addresses problem
On 05/12/06 11:12, Anton Basistov wrote: Gordon Messmer wrote: Ok. I'll ask from another side. Can I configure Courier not to tell me about the wrong addresses? Even if my mail client very bad? I take it that what you want to do is: If mail comes from a particular client, accept it whoever it is to, and bounce it later if they don't exist. If it comes from anywhere else, reject at SMTP time if the recipient doesn't exist. I did this once, using a localmailfilter, but I forget the details. It is something like: Create a catch-all alias whose .courier file bounces messages. Write a localmailfilter which rejects a recipient if they are mapped to the catch-all alias and the client IP address is not equal to the one with the bad mail client, and accepts it otherwise. -- Martin Orr - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
[courier-users] multiply mail-addresses problem
I have some problem: If I want to send a letter to many recipients, I type many addresses in TO. And if the only one address is nonexistent (and it is at local domain) Courier does not take my letter at all during email-client-smtp-session. And it does not say which address is wrong. Do you know, how can I fix it? I want Courier to take the mail in any case, and just to send back error msg, if error. Anton. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] multiply mail-addresses problem
On Mon, December 4, 2006 12:42 pm, Anton Basistov wrote: I have some problem: If I want to send a letter to many recipients, I type many addresses in TO. And if the only one address is nonexistent (and it is at local domain) Courier does not take my letter at all during email-client-smtp-session. And it does not say which address is wrong. Sam already answered this question the last time you asked it. The mail CLIENT sends this information one address at a time to courier, courier tells the client at the time its sent that the address is nonexistent. It is the mail CLIENTS job to tell you which one. Do you know, how can I fix it? I want Courier to take the mail in any case, and just to send back error msg, if error. Courier can if your mail CLIENT tells it to. You are barking up the wrong tree. Anton. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] multiply mail-addresses problem
If I want to send a letter to many recipients, I type many addresses in TO. And if the only one address is nonexistent (and it is at local domain) Courier does not take my letter at all during email-client-smtp-session. And it does not say which address is wrong. Sam already answered this question the last time you asked it. The mail CLIENT sends this information one address at a time to courier, courier tells the client at the time its sent that the address is nonexistent. It is the mail CLIENTS job to tell you which one. Do you know, how can I fix it? I want Courier to take the mail in any case, and just to send back error msg, if error. Courier can if your mail CLIENT tells it to. You are barking up the wrong tree. Ok. I'll ask from another side. Can I configure Courier not to tell me about the wrong addresses? Even if my mail client very bad? I am asking because I know, that SENDMAIL can do that. Thanks. Anton, again. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] multiply mail-addresses problem
Anton Basistov wrote: Ok. I'll ask from another side. Can I configure Courier not to tell me about the wrong addresses? Even if my mail client very bad? Yes, it can, but not selectively. That is, if you want courier to be quiet about bad addresses, and bounce them, it will behave that way for your users and also for the internet at large. What will then happen is spammers will attempt dictionary attacks against your mail server to get valid addresses, and will generate all positives. They'll then send huge volumes of spam to your server, which courier would accept and then try to bounce. The spam would have a bad return address, and then sit undeliverable in your mail queue for a very long time before bouncing to the postmaster. The end result is that you can't read postmaster mail because there are too many messages, and you can't determine whether or not there's any valid problems with your mail server. The problem increases until your mail queue is full of thousands of messages which can't be delivered, and legitimate service degrades until it's not usable any more. Don't go down that road. It sucks. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
