[Dovecot] Sieve Vacation

[pod]

>>>>> "TS" == Timo Sirainen <tss at iki.fi> writes:

    TS> On Fri, 2007-02-23 at 17:52 +0100, Matthieu Vogelweith wrote:
    >> I'm using Postfix/LDAP with virtual domains and Dovecot 1.0rc15 as
    >> LDA=20 with sieve plugin. The sieve plugin works fine except
    >> vacation.  How can I increase the log level of deliver to see
    >> what's the matter ?

The sieve plugin implements vacation by invoking /usr/lib/sendmail.  If
you have mail_debug=yes in dovecot.conf this will result in
/usr/lib/sendmail being invoked in an environment with MAIL_DEBUG set
which also causes the Postfix's 'sendmail' to invoke debugger_command as
set /etc/postfix/main.cf.  If debugger_command is not set it will crap out
and no mail will get sent.

Before invoking sendmail libsieve has made the following checks.  These
are done in libsieve/bc_eval.c shouldRespond() and a response won't get
generated if any of the following are true

 - Auto-Submitted: header exists with any value except 'no'
 - Precedence: header exists with value 'junk', 'bulk' or 'list'
 - the 'envelope' sender and 'envelope' recipient are the same
 - the 'envelope' recipient is not found in the message To: CC: or BCC:
   fields

The 'envelope' sender is taken from a Return-Path: header in the message.
The 'envelope' recipient is taken from -d option passed to deliver.  If it
is a bare username is gets 'canonicalised' by the libsieve code to
'<username>@unspecified-domain' this means it is highly unlikely to pass
the last test in the list above.

Note that these tests occur in the libsieve and if they indicate that no
response should be sent then neither of src/sieve-cmu.c autorespond() nor
src/sieve-cmu.c send_response() will ever get invoked thus no duplicate
checking will occur i.e. none of the Dovecot LDA plugin code even gets a
look in.

I am currently successfully running dovecot LDA for virtual users with at
least a basically working sieve vacation using the following configs
snippets

/etc/dovecot/dovecot.conf:

    [...]
    protocol lda {
      hostname = fqdn.hostname.example
      postmaster_address = postmaster at herald.ox.ac.uk
      mail_plugins = cmusieve
    }

    auth default {
    [...]
      socket listen {
        master {
          path = /var/run/dovecot/auth-master
        }
      }
    }

/etc/postfix/main.cf:

    [...]
    debugger_command = (strace -p $process_id 2>&1 | logger -t postfix/debug -p mail.info;) & sleep 5
    [...]
    virtual_transport = dovecot:
    dovecot_destination_recipient_limit = 1
    virtual_minimum_uid = 1000
    virtual_mailbox_maps = ldap:/etc/postfix/virtual.mailbox.ldap.cf
    virtual_uid_maps = ldap:/etc/postfix/virtual.uid.ldap.cf
    virtual_gid_maps = static:100
    [...]

/etc/postfix/master.cf:

    [...]
    dovecot   unix  -       n       n       -       -       pipe
      flags=ODRhu user=dovecotlda argv=/usr/lib/dovecot/deliver -f ${sender} -d ${recipient}

I can't remember exactly which of these settings are essential but note
flags=...R... to ensure a Return-Path: header and -d ${recipient} where
Postfix will expand this into a _full_, i.e. user at domain address.