sa-learn, dovecot virtual users and virtual user configs

Well, I wanted independent SpamAssassin Bayes databases per user (different users, different preferences). For that, RoundCube already set up the Junk folder. However, I wanted the ability (for myself, as well for my other users) to individually mark messages as either Spam or Ham.

RoundCube: Inbox view
RoundCube: Inbox view



Now, as I said before I wanted a trivial way to mark messages as Spam or Ham (without using the command line each time).

RoundCube: Adjusted Inbox View
RoundCube: Adjusted Inbox View

Now, that was the mailbox setup part. Now we do have to do some command line foo (yeah, it’s still necessary) to actually learn the mails as spam or ham. First we need a script, which scans the Maildir for each domain/user separately, and then creates the bayes database.

This script is based on work from nesono and Anyhow, the script will scan each user folder (you might need to adjust the MAIL_DIR and SPAMASS_DIR variable, depending on where your MAIL_DIR is located.

Next, we need to adjust the SPAMD options to use the virtual-config-dir (that’s the SPAMD name for this).

As you can see, I basically appended the following to the OPTIONS variable: –virtual-config-dir=/var/lib/spamassassin/%d/%l -x -u mail

Now, here’s a couple of pointers:

This option specifies where per-user preferences can be found for virtual users, for the -x switch. The pattern is used as a base pattern for the directory name. Any of the
following escapes can be used:

%u — replaced with the full name of the current user, as sent by spamc.
%l — replaced with the ‘local part’ of the current username. In other words, if the username is an email address, this is the part before the “@” sign.
%d — replaced with the ‘domain’ of the current username. In other words, if the username is an email address, this is the part after the “@” sign.
%% — replaced with a single percent sign (%).

-u username, –username=username
Run as the named user. If this option is not set, the default behaviour is to setuid() to the user running “spamc”, if “spamd” is running as root.

Note: “–username=root” is not a valid option. If specified, “spamd” will exit with a fatal error on startup.

Now, only a small adjustment is still needed. In order for the inbound mails to be scanned with the per-user db’s, you need to adjust postfix’s file, to run spamc with the per-user db.

After that’s done (and a restart of postfix, spamassassin and dovecot) you should be the proud owner of a per-user dovecot/postfix/spamassassin implementation.

Postfix, soft_bounce=yes and redelivering mails

Well, I’m setting up spam/virus filter at the moment. Somewhere I found, that when doing so one should enable soft_bounce=yes in your /etc/postfix/ Now, once I finished setting up my mailing setup, I wanted to manually force the delivery.

Now, if you fixed the mail delivery, you just need to enter the following:

However if you want to delete the mail from the postfix queue: