I am running Fedora 14. I have a dovecot imap server running.
I am using MIMEDefang milter to do spam filtering via sendmail, haven't got it to do virus filtering yet, but will. I have sendmail using dovecot's lda for the local mail delivery. I have sieve enabled in lda and the sieve filters in place. So, mail gets directly delivered to the folders and not to INBOX if a filter matches. One filter looks for the X-Spam-Score header created by MIMEDefang when it calls spamassassin.
Everything is working OK.
The issue is that some spam doesn't get tagged by spamassassin and ends up in the INBOX. However, if I enable evolution to filter for junk evolution finds it and moves it to the Junk folder. I believe evolution finds it because in the past I had evolution doing all the filtering and had marked various emails as junk. I believe evolution runs spamassassin with a learning mode so when I mark an email as junk it learns that is junk and modifies a private file for the user indicating that this user considers this email to be junk and uses that info in future email filtering. Here is a reference to the user specific spamassassin config file from the spamassassin man page: ------------------------------------------------------ Individual user preferences are loaded from the location specified on the "spamassassin", "sa-learn", or "spamd" command line (see respective manual page for details). If the location is not specified, ~/.spamassassin/user_prefs is used if it exists. SpamAssassin will create that file if it does not already exist, using user_prefs.template as a template -------------------------------------------------------
My question is whether there is anyway for the virtual mail users I now have to do a similar kind of learning ?
I'd expect you'd need a way for ldap to run spamassassin with some option to look in the virtual user's home directory for a virtual user specific spam rule file and run spam on the mail again, even though sendmail ran it through a milter already but without the user's spam rule file, and tag the message as spam before running sieve that could see the added header and file it accordingly. You'd only need to run it on messages that MMEDefang didn't already identify as spam. I am not sure how you'd be able to update that local spam learning file though.
Anyway, I thought I would ask if there is some way to allow my configuration to do personalized spam learning for my virtual users. I am assuming the answer is no, but there may be something out there I haven't run across yet.
Thanks Chris Kottaridis
On Thu, 2011-07-28 at 07:32 -0430, Patrick O'Callaghan wrote:
On Thu, 2011-07-28 at 00:43 -0600, Chris Kottaridis wrote:
My question is whether there is anyway for the virtual mail users I now have to do a similar kind of learning ?
What is a "virtual user"?
They don't have accounts on the machine so they can't login. But, Imap recognizes them as users. They do have a home directory from imap's persective.
I got the term from the dovecot documentation here:
http://wiki2.dovecot.org/VirtualUsers
I also did find out something last night on further search that I can potentially connect spam to an SQL database. With that tool I may be able to run sa-learn on virtual users mail to define virtual user specific filtering. Have the users store mail they consider to be spam in a known mailbox name. Then run a cron job to run sa-learn on each user's mailbox telling it's --spam and run sa-learn on the other mailboxes telling sa-learn it is --ham and run sa-learn with the -u option.
From what I can tell sa-learn will then store user specific spam info in the database. I still need a way to run spamassassin on incoming mail to let it know what the username is that the email is destined for. So, maybe I need to create a wrapper to make a local mailer that runs spamc on mail that hasn't already been tagged as spam using the username and then fed that into dovecot-lda for the actual delivery.
This is one of the pages that talks about spamassassin and databases:
http://vps.donwyatt.com/My_SpamAssassin_MySQL_How-To.html http://www.wistful.net/wiki/My_SpamAssassin_MySQL_How-To http://wiki.apache.org/spamassassin/UsingSQL
The last one has a section entitled: "Global, Per-Domain, and Per-User Preferences via SQL"
I don't know for sure yet if this will give me what I want, because I haven't really had time to play with anything. But, I do have hope.
Thanks Chris Kottaridis
poc
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Chris Kottaridis -
Patrick O'Callaghan