Thank you, Alex - works like a charm! :-)The wiki does not seem to currently document the "mail_log_prefix" setting anywhere (the only Google search hits are from the alias and tutorials from other sources), so maybe the Devecot team would want to add this to a wiki page...
Thanks & BR Andreas Am 05.06.2017 um 16:02 schrieb Alex JOST:
Something like this should log the session.
/etc/dovecot/conf.d/10-logging.conf:
mail_log_prefix = "%s(%u,%{session}): "
