I hoped I don't have to switch to syslog logging. Well, anyway.
I changed 10-logging.conf: syslog_facility = uucp and commented out the other log lines.
rsyslog.d/50-default.conf: uucp.debug -/var/log/dovecot/debug.log uucp.info -/var/log/dovecot/dovecot.log uucp.warn -/var/log/dovecot/warn.log uucp.err -/var/log/dovecot/error.log uucp.crit -/var/log/warn.log
No fancy redirects with rsyslog yet, plain logging by facility and level.
But it logs only to /var/log/syslog. As if dovecot sets another facility. I've used uucp in the past with success (not with rsyslog, but with syslog). AFAIK, uucp still exists as a facility in rsyslog. Shouldn't the above work?
(Yes, I restarted both daemons.)
Kai