[Dovecot] %{session} does not work with deliver_log_format

Hi,

# 2.1.10: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-45-server x86_64 Ubuntu 10.04.4 LTS deliver_log_format = mailbox: deliver: session=<%{session}> msgid=%m from=%f: %$

produces log messages always containing "session=", like this one:

Feb 24 09:22:09 10.129.3.233 dovecot: lmtp(3484, user@example.org): mbnWK6/NKVGcDQAAiWCYmA: sieve: mailbox: deliver: session= msgid=20130224082208.8A807C0CF@mx01.example.org from=postmaster@example.org: stored mail into mailbox 'INBOX/postmaster'

http://wiki2.dovecot.org/Variables leads me to the assumption that %{session} works "everywhere" and for deliver_log_format too.

Is deliver_log_format variable expansion handled differently from login_log_format_elements and mail_log_prefix?

Regards Daniel

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