[Dovecot] "Time just moved backwards" in Dovecot in a Xen DomU

[PGNet Dev]

and, of course, immediately after hitting 'Send', i see in logs,

Oct 06 11:22:08 dovecot: Error: Time just moved backwards by 1
seconds. I'll sleep now until we're back in present.
http://wiki.dovecot.org/TimeMovedBackwards

Oct  6 11:22:07 mx ntpd[17697]: time reset -2.075483 s
Oct  6 11:22:16 mx ntpd[17697]: synchronized to 128.2.1.21, stratum 2

:-(