Backup/Secondary relay server (mailertable)

[dungkaitai]

Hi

I wanted to know how should the backup/secondary relay server should be setup.

DNS is like this:

MX 10 mail.fbsd.org
MX 20 backup.fbsd.org

Suppose backup server use sendmail.
Should I just leave mailertable empty or like this:
fbsd.org smtp:[mail.fbsd.org]

Thanks.

-- This message has been scanned for viruses and dangerous content by MailScanner.