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Timo, would you consider inclusion of this patch which will skip logging deliveries if deliver_log_format is empty:

Committed, slightly modified: http://hg.dovecot.org/dovecot-2.0/rev/0e406e7cb609

Thanks. I tried to contribute by updating the wiki docs, but it belched when I saved the update:

TextCha: Wrong answer! Go back and try again...

Here's what I tried to add at the bottom (in text mode)

The {{{deliver_log_format}}} specifies logging details for a successful
delivery.  (versions>2.0.13: leaving it empty will disable this logging).
See example configuration files for a full list of variable expansion:

{{{
delivery_log_format = msgid=%m: %$
}}}

Joseph Tam <jtam.home@gmail.com>