This may be related to Bug #715056. From the comments in there I was
able to find a main.cf-backup file in /var/backup/dovecot-postfix/ so
that helped, but a warning should still be present.
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Public bug reported:
After upgrading dovecot-postfix, my postfix configuration file
(/etc/postfix/main.cf) had been overwritten without warning. This caused
me to lose several customizations including postgrey and DNS RBLs.
The expected behavior would be the upgrade should warn me that the conf
f