Hi there,
after migrating to SLES11SP1 from SLES11 I had some issue - after starting migrated and actualized system I found that postfix has a crazy merged configuration "main.cf". My comments stays, but value was a default. For example:
inet_interfaces = localhost

is the default, we run it on my server's IP

Also $mydestination, $mynetworks, ...

And I'm really sure there was a non default values, this server works a few months

Isn't it some error ? Or I didn't read something somewhere ? Others configurations like a cyrus-imap or so aren't affected.
For next time, I'll make a backup copies, of course )
Did it happen anybody else ?