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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org
Date: Tue, 21 Apr 2009 11:06:01 +0200
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Subject: Preventing ntpd from adjusting time (backwards)
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Hi,

Some coarse reading of ntpd(8) and ntp.conf(5) doesn't lead me to believe it's 
possible to make ntpd *not* adjust the time. With adjust I don't mean the skew 
operation, but really change the time. Backwards is my primary concern but if 
it can be turned off completely it's fine with me.

Reason being dovecot bailing out when this happens:
Apr  1 16:18:26 squish ntpd[1353]: time reset -6.711955 s

Apr  1 16:18:26 mx1 dovecot: Fatal: Time just moved backwards by 6 seconds. 
This might cause a lot of problems, so I'll just kill myself now. 
http://wiki.dovecot.org/TimeMovedBackwards

-- 
Mel