dovecot-postfix upgrade overrides main.cf

[Craig Ingram]

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 file was being overwritten and allowed me to keep my existing configuration.

package information:
dovecot-postfix:
  Installed: 1:1.2.9-1ubuntu6.3
  Candidate: 1:1.2.9-1ubuntu6.3
  Version table:
 *** 1:1.2.9-1ubuntu6.3 0
        500 http://security.ubuntu.com/ubuntu/ lucid-updates/main Packages
        500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
        100 /var/lib/dpkg/status
     1:1.2.9-1ubuntu6 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages

ubuntu information:
Description: Ubuntu 10.04.2 LTS
Release: 10.04

[Craig Ingram (cji)]

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.