[Dovecot] Postfix locking equivalence?

[Warren Togami]

/etc/postfix/main.cf.default:
mailbox_delivery_lock = flock, dotlock

Is flock equivalent to dovecot's fnctl locking?  For mbox what type of
locking settings should I be using?  (No NFS, only local filesystem.)

I'm using procmail to deliver mail to my mboxes.  Does the above postfix
setting effect procmail's locking method?  I use rules like this:

:0
* ^X-BeenThere: dovecot at procontrol.fi
DOVECOT

If I understand this correctly, :0: in procmailrc would explicitly use
dotlocks instead of "kernel-locks" as procmail calls it.  I'm not fully
understanding all this locking stuff.

Warren Togami
warren at togami.com

p.s.
Timo, I received your test message after my prior posting attempt
bounced.  I had this error message:

Reporting-MTA: dns; danu.procontrol.fi
Arrival-Date: Sat, 17 May 2003 12:52:08 +0300 (EEST)

Final-Recipient: rfc822; dovecot at procontrol.fi
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; mail forwarding loop for
dovecot at procontrol.fi