Le 12/09/2013 08:31, Steffen Kaiser a écrit :

above script is missing important log information: the current uid and $HOME; also sa-learn knows -D

I would change for a testing period: #!/bin/sh echo /usr/bin/sa-learn $* /tmp/sendmail-msg-$$.txt ; echo "$$-start ($*)" >> /tmp/sa-learn-pipe.log ; #echo $* > /tmp/sendmail-parms.txt ; cat<&0 >> /tmp/sendmail-msg-$$.txt ; /usr/bin/sa-learn -D $* /tmp/sendmail-msg-$$.txt

...

/tmp/sa-learn-pipe.$$.tmp 2>&1; echo $$ sa-learn rc=$? id=$(id) HOME=$HOME >> /tmp/sa-learn-pipe.log while read line; do echo $$-sa-learn "$line" >> /tmp/sa-learn-pipe.log done < /tmp/sa-learn-pipe.$$.tmp rm -f /tmp/sendmail-msg-$$.txt /tmp/sa-learn-pipe.$$.tmp echo "$$-end" >> /tmp/sa-learn-pipe.log ; exit 0;

thank you a lot, i tried this, and here is what i got in the log :

22:00 root@effraie01 ~ # cat /tmp/sa-learn-pipe.log ... 4933-start (--ham) 4933 sa-learn rc=0 id=uid=3000(vmail) gid=3000(vmail) groups=3000(vmail) HOME= 4933-end 4953-start (--spam) 4953 sa-learn rc=0 id=uid=3000(vmail) gid=3000(vmail) groups=3000(vmail) HOME= 4953-end

so i tried

22:01 root@effraie01 ~ # sa-learn --username=vmail --backup v 3 db_version # this must be the first line!!! v 0 num_spam v 0 num_nonspam

Read man sa-learn section MIGRATION: "Note that if you have individual user databases you will have to perform a similar procedure for each one of them."

sa-learn --backup > backup.txt

backups the database of one particular user, I assume you use root to issue the command? But is the antispam learning script above runs as root, too?

if i correctly understood what you told me, the sa-learn-pipe (and so sa-learn itself) run as vmail, wich is the global user i use for email. and there is still nothing in sa-learn database. (i dod not have many spam on that server, but still have passed a few to sa-learn via that dovecot-antispam plugin). Maybe everything is normal, but with my low level spamassassin/dovecot comprehension, i think i would have something in sa-learn db.

-- Mathieu R.

Le 13/09/2013 17:29, RW a écrit :

On Thu, 12 Sep 2013 22:09:42 +0200 Mathieu R. wrote:

...

22:01 root@effraie01 ~ # sa-learn --username=vmail --backup v 3 db_version # this must be the first line!!! v 0 num_spam v 0 num_nonspam

sa-learn --username sets the virtual user not the unix user. (BTW sa-learn --dump magic is a quicker way of reading the metadata)

By default SA stores the bayes database files under a user's home directory. If you run sa-learn as vmail, which doesn't have a home directory, it will probably just give up.

What you need to do is set bayes_path (in local.cf) to a directory to which vmail has access, then run sa-learn as vmail. Alternately you can setup one of the SQL backends.

Setting bayes_path made it fall in work, thank a lot!

I'm posting this through gmane as I'm not subscribed to dovecot list. I replied in that SpamAssassin list before spotting that it was cross-posted. You can ignore most of it now, but I'll quote what I wrote about learning ham:

"I'm sceptical that the Antispam plugin can learn enough ham this way. As I understand it the only mail that gets learnt as ham will be false-positives based on the overall spamassassin score, irrespective of the Bayes result. Bayes needs (by default) 200 spams and hams to even start classifying and much more for optimal results - I don't expect to get 200 FPs in the rest of my life. Unless this is high volume server with a shared database, I'd suggest either learning a few thousand hams manually, or implementing an unsure folder. You can also mitigate the problem by autotraining with a high ham threshold, but then you really need to be careful to move all spam to the spam folder. "

as my english is approximative, i'm not sure to really understand what you mean :

should i :

• do not use antispam-plugin to learn spam, but do it manually with sa-learn /path/to/ham ?
• do not use antispam-plugin at alla ?
• use antispam-plugin to learn ham, but still do it by hand with
  sa-learn /path/to/ham ?
• take care for something else ?

-- Mathieu R.