ntpdate should be run just once and then just have ntpd on.. the nptdate should bring the server to the proper time and cause dovecot to fail..you should only need to run it once (assuming the server is left on and not off for long periods). I run ntpd as a daemon, but not ntpdate... you do have to set up ntp as you have done to get in the pools, but leaving ntp on as a daemon should not affect it...at least it does not with mine.
Dear BOB. H,
Thanks for your response, you are right, it is "ntpdate" that create the problem after reboot not "ntpd". once the time is corrected by "ntpdate" after that no issues as long as server is up.
there are other solution, who wish to run both daemons. bash script can monitor dovecot every 5min through cron. when dovecot will stop due to time shifted error after reboot, script will start it again. and would be fine as long as server does not reboot again.
Thanks / Regards
Prabh S. Mavi