How can I find out which Postfix version I'm running?

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Submitted by Priyanka Tyagi (not registered) on Tue, 2009-04-28 19:29.
"postconf -d mail_version" will work
Submitted by Ville Walveranta (not registered) on Sat, 2008-11-08 20:53.

Or even more simply:

postconf mail_version