[Dovecot] Empty Mails from MAILER-DAEMON with Dovecot-Antispam and DSPAM

[Tom Hendrikx]

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On 24-10-13 09:59, Anna Christina Naß wrote:
> Hallo,
> 
> I've installed the dovecot-Antispam extension to my dovecot IMAP 
> installation in conjunction with DSPAM.
> 
> But when moving Mails from e.g. INBOX to Spam or vice versa, empty
> mails from MAILER-DAEMON appear after the original mail has been
> moved. This happens using Thunderbird 17esr, K-9 Mail on Android
> and Apple Mail (Mountain Lion). (Perhaps also when using a Webmail
> IMAP client)
> 
> The source from one of these empty mails looks like this:
> 
> ----snip---- Return-Path: <MAILER-DAEMON> X-Original-To: acn 
> Delivered-To: acn at mydomain.name Received: from localhost
> (localhost.localdomain [127.0.0.1]) by <my host name> (Postfix)
> with SMTP id CB81B140011 for <acn>; Thu, 24 Oct 2013 09:23:33 +0200
> (CEST) X-DSPAM-Reclassified: Spam Message-Id:
> <20131024072333.CB81B140011@<my host name>> Date: Thu, 24 Oct 2013
> 09:23:33 +0200 (CEST) From: MAILER-DAEMON ----/snip----
> 
> Do you have any idea why these mails appear and how I can prevent
> it?
> 
<snip>

> # 2.1.7: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-4-686-pae i686
> Debian 7.2 ext4 auth_cache_size = 1 M auth_mechanisms = plain
> login auth_worker_max_count = 5 listen = *, [::] log_timestamp =
> "%Y-%m-%d %H:%M:%S " mail_location = maildir:/var/vmail/%u/Maildir 
> mail_privileged_group = mail mailbox_idle_check_interval = 15 secs 
> 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 imapflags
> notify passdb { args = /etc/dovecot/ldap-passdb.conf.ext driver =
> ldap } plugin { antispam_allow_append_to_spam = no antispam_backend
> = dspam antispam_dspam_args =
> --user;%Lu;--deliver=spam,innocent;--source=error

You're telling DSPAM to re-deliver e-mail after retraining. You don't
want that, as you already received the e-mail. You only want DSPAM to
re-learn the message, so try something like:

antispam_dspam_args = --user;%Lu;--deliver=;--source=error


> antispam_dspam_binary = /usr/bin/dspamc antispam_dspam_notspam =
> --class=innocent antispam_dspam_spam = --class=spam 
> antispam_signature = X-DSPAM-Signature antispam_signature_missing =
> move antispam_spam = Spam;Junk antispam_trash = Trash;Deleted
> Items;Deleted Messages

<snip>

Kind regards,
	Tom
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