Dovecot2 Antispam MAILTRAIN backend with SpamAssassin

[Leander Schäfer]

I remember, that I also struggled for quite a while until I figured it 
out. Here is what I used on my FreeBSD Dovecot installation ...

Remember, that the following code is working on "dovecot --version 
1.2.12" ... but it could also be valid for later versions. I simply 
havn't checked it out yet.

   ### Dovecot AntiSpam ###
    # mail signature (used with any backend requiring a signature)
    #antispam_signature = X-Spam-Status
    #antispam_signature_missing = move

    antispam_mail_sendmail = /usr/local/etc/dovecot/sa-learn-helper.sh
    antispam_mail_sendmail_args = --username=%Lu
    antispam_mail_spam = --spam
    antispam_mail_notspam = --ham
    antispam_mail_tmpdir = /tmp
    antispam_spam = Spam
    #antispam_unsure = Virus
    antispam_trash = Trash


echo '#!/usr/local/bin/bash

#/usr/local/bin/sa-learn ${1} ${2} ${3} ${4} &> 
/var/log/DoveDamnAntiSpam.log
/usr/local/bin/sa-learn "${1}" "${2}" "${3}" "${4}"
exit 0

' > /usr/local/etc/dovecot/sa-learn-helper.sh
chmod 0777 /usr/local/etc/dovecot/sa-learn-helper.sh ;
chown root:wheel /usr/local/etc/dovecot/sa-learn-helper.sh ;


Best regards
Leander



Am 15.07.14 15:00, schrieb Mohammad S. Babaei:
>
>
> Hi there,
>
> I've already asked this question on FreeBSD forums without getting any
> response. So, I thought it's a good idea to ask it again here.
>
> I've setup Dovecote2 (2.2.13) + Postfix + SpamAssassin on my FreeBSD 10
> VPS and it works flawlessly. Though, I couldn't setup the Dovecot
> Antispam plugin to train SpamAssassin when I move mails to the Junk
> folder.
>
> I installed the plugin from FreeBSD ports and followed the official
> documentation [1] and the man page [2] without any success.
>
> This is my configuration:
>
> ########
>
> # 2.2.13: /usr/local/etc/dovecot/dovecot.conf
> # OS: FreeBSD 10.0-RELEASE-p6 i386 ufs
> auth_mechanisms = plain login digest-md5
> disable_plaintext_auth = no
> first_valid_gid = 6
> first_valid_uid = 26
> last_valid_gid = 6
> last_valid_uid = 26
> lmtp_save_to_detail_mailbox = yes
> mail_gid = mail
> mail_location = mdbox:/mail/%d/%u
> mail_privileged_group = mail
> mail_uid = mailnull
> managesieve_notify_capability = mailto
> managesieve_sieve_capability = fileinto reject envelope
> encoded-character vacation subaddress comparator-i;ascii-numeric
> relational regex imap4flags copy include variables body enotify
> environment mailbox date ihave
> namespace inbox {
>   inbox = yes
>   location =
>   mailbox Archive {
>   auto = no
>   special_use = Archive
>   }
>   mailbox Drafts {
>   auto = subscribe
>   special_use = Drafts
>   }
>   mailbox Flagged {
>   auto = no
>   special_use = Flagged
>   }
>   mailbox Junk {
>   auto = subscribe
>   special_use = Junk
>   }
>   mailbox Sent {
>   auto = subscribe
>   special_use = Sent
>   }
>   mailbox Trash {
>   auto = subscribe
>   special_use = Trash
>   }
>   mailbox virtual/All {
>   auto = no
>   special_use = All
>   }
>   prefix =
>   separator = /
> }
> passdb {
>   args = /mail/%d/dovecot_passwd
>   driver = passwd-file
> }
> plugin {
>   antispam_backend = MAILTRAIN
>   antispam_mail_notspam = --ham
>   antispam_mail_sendmail = /mail/sa-learn-pipe.sh
>   antispam_mail_spam = --spam
>   antispam_spam = Junk
>   antispam_trash = Trash
>   quota_rule = *:storage=8GB
>   sieve = /mail/%d/%u/dovecot.sieve
>   sieve_dir = /mail/%d/%u
>   sieve_global_dir = /mail/sieve
>   sieve_global_path = /mail/sieve/globalfilter.sieve
> }
> protocols = imap pop3 lmtp sieve
> service auth {
>   unix_listener auth-client {
>   group = mail
>   mode = 0660
>   user = postfix
>   }
>   unix_listener auth-master {
>   group = mail
>   mode = 0600
>   user = mailnull
>   }
>   user = root
> }
> service imap-login {
>   inet_listener imap {
>   address = *
>   port = 143
>   }
>   inet_listener imaps {
>   address = *
>   port = 993
>   }
>   process_limit = 32
>   process_min_avail = 1
> }
> service lmtp {
>   unix_listener /var/spool/postfix/private/dovecot-lmtp {
>   group = postfix
>   mode = 0660
>   user = postfix
>   }
> }
> service managesieve-login {
>   inet_listener sieve {
>   port = 4190
>   }
>   process_min_avail = 0
>   service_count = 1
>   vsz_limit = 64 M
> }
> service managesieve {
>   process_limit = 1024
> }
> service pop3-login {
>   inet_listener pop3 {
>   address = *
>   port = 110
>   }
>   inet_listener pop3s {
>   address = *
>   port = 995
>   }
>   process_limit = 32
>   process_min_avail = 1
> }
> ssl_cert = </etc/ssl/dovecot/cert.pem
> ssl_key = </etc/ssl/dovecot/key.pem
> userdb {
>   args = /mail/%d/dovecot_passwd
>   driver = passwd-file
> }
> verbose_proctitle = yes
> protocol lmtp {
>   mail_plugins = " sieve"
>   postmaster_address = postmaster at SomeDomain.com
>   quota_full_tempfail = yes
> }
> protocol sieve {
>   mail_max_userip_connections = 10
>   managesieve_implementation_string = Dovecot Pigeonhole
>   managesieve_logout_format = bytes=%i/%o
>   managesieve_max_line_length = 65536
> }
> protocol imap {
>   imap_client_workarounds = delay-newmail tb-extra-mailbox-sep
>   mail_plugins = " quota imap_quota antispam"
> }
> protocol pop3 {
>   mail_plugins = " quota"
>   pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
> }
> protocol lda {
>   mail_plugins = " quota sieve"
>   postmaster_address = postmaster at SomeDomain.com
>   sendmail_path = /usr/local/sbin/sendmail
> }
>
> ########
>
> And, this is the script /mail/sa-learn-pipe.sh:
>
> ########
>
> echo /usr/local/bin/sa-learn $* /tmp/sendmail-msg-$$.txt
> echo "$$-start ($*)" >> /tmp/sa-learn-pipe.log
>
> #echo $* > /tmp/sendmail-parms.txt
> cat<&0 >> /tmp/sendmail-msg-$$.txt
>
> /usr/local/bin/sa-learn $* /tmp/sendmail-msg-$$.txt
>
> rm -f /tmp/sendmail-msg-$$.txt
>
> echo "$$-end" >> /tmp/sa-learn-pipe.log
>
> exit 0
>
> ########
>
> I made it excecutable by all users using chmod a+x
> /mail/sa-learn-pipe.sh
>
> The problem is, there is no log in /var/log/maillog regarding the
> Antispam plugin, and the script won't get called when I move any message
> in/out to/from Junk folder.
>
> I'll appreciate any help.
>