> ; zone file fragment
> IN MX 10 mail.example.com
> mail IN A 10.10.10.100
> IN A 10.10.20.100
> 3. Clients will use mail.example.com as server.
> Only problem I see now is when one of the postfix servers dies. Clients
> will still try to send mails to it as they are DNS RR'ed, but would get no
> response ofcause if they hit the dead one.
In that case the client should try the other IP address.