----- Original Message ----- From: "Patrick T. Tsang" <[EMAIL PROTECTED]> To: "Matt Kettler" <[EMAIL PROTECTED]> Sent: Thursday, November 20, 2003 6:57 PM Subject: Re: [SAtalk] mysql spamc ignores the email in mailling list
> At 06:09 PM 11/19/03 +0800, Patrick T. Tsang wrote: > > > From the maillog, I have checked that spamd has successfully filtered > the > > >mail at first. > > >However, spamd only check email using the last email address found in the > > >mailling list and check against the user-defined rules in Mysql. > > >That is, it skips the user-defined of the others in the mailling list. > > >Of course, spamc also check against the global rules in the mysql. > > > > > >I would like to know if it is normal?? > > >OR it is the problem in postfix mailler? > > > > It's normal.. in fact, it would be impossible for it to behave any other > > sensible way, but there are some trade-offs you can make in how you > > configure your mail handling. > > > > As far as SA is concerned, there is always only one user prefs per message > > it processes. That's because there's only ONE message, even if there are > > multiple recipients. Thus, SA can only make one choice. It cannot "mark > > this message as spam for joe, but not for sally". It can only mark the > > message or not. > > > > A lot of this boils down to what spamassassin (and spamc) fundamentally > > is.. a mail filter. As such, spamassassin has no authority whatsoever over > > transport or delivery of messages. It can never create new messages, > delete > > messages, or change the recipient of a message (although it can influence > > other programs to do so). Since it cannot create messages, when it > receives > > one message for multiple users, it cannot "break it up" into one message > > per user and process each separately. It must merely process the one and > > only message it was given, and return only one email as output. > > > > When hooked into the MTA side of the email world, SA gets called once per > > message in transport.. You gain speed in that SA only has to scan the > > message once even if it goes to multiple people, but you loose flexibility > > in user_preferences when a message goes to multiple people. > > > > One solution to the flexibility side is to integrate SA on the MDA side of > > things.. Here SA gets called as messages are delivered to each user's > > mailbox, and can process each user's mail in a completely independent > > manner. One drawback here are that a 20 recipient message gets processed > 20 > > times, increasing server load. This can also only be done on a mailserver > > which really does deliver mail to a user's mailbox, not a relaying gateway > > (there's no delivery happening on a relaying gateway, just transport). > > > > There are some compromise solutions.. One solution on the MailScanner list > > posted by a sendmail user was to force sendmail to re-queue messages so > > that each only has one recipient.. You still suffer in efficiency, but > you > > can now do it on a relaying gateway. (you also suffer increased bandwidth > > between your two mailservers, as a 20 recipient message must be delivered > > 20 times to the internal server). > > > Thanks for your suggestions. > I am using Postfix+Cyrus-Imapd+OpenLDAP+Spamassassin.w/Mysql > All virtual users are in Cyrus-imapd, user records in LDAP , user-defined > rules in Mysql > > I would like to have any worked examples if you have. > I don't like sendmail so this is tough enough for me to do with it. > Still don't know why people don't implement this, I can't see any info on > the interent. > > Best Regards > Patrick Tsang > ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Spamassassin-talk mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/spamassassin-talk
