sendmail as backup server (listed as second MX)

[Valcor]

Hi All,

I'm trying to work this out, and it's driving me crazy. I've searched all over the place, and keep finding documents, but each document says something different. I'm trying to setup sendmail to act as a backup mail server for the main server. MX records are setup as such:

domain.com. IN MX 10 mail.domain.com.
domain.com. IN MX 20 mail.otherdomain.com.

mail IN A 123.123.123.123

One site said I should put the data into /etc/mail/relay-domains another said into /etc/mail/mailertable, one even said something about modifying the .cf file itself. Due to all the conflicting info, I'm more confused now than I was when I set out to try setting it up.

I'm running RHL 7.1, with Sendmail 8.11.6. Any help would be much appreciated.

Thanks in advanced
Jon

 

[khaledeshah]

You must put the domains which your server should work for it as a backup server in relay-domains

 

[spddmon]

Hi. I have a similar issue. Our exchange server is setup as the primary email server, I had to setup a backup "sendmail" server on SCO openserver 5.0.6 using sendmail 8.11. The MX records are set this way:
MX 5 mail.mydomain.com
MX 10 email.mydomin.com
both servers are on the same domain, both are working independently; I can send and receive to name@mail.mydomain.com, and also to name@email.mydomin.com.
But when our exchange server went down, mail sent to the primery server wouldn't go to the sendmail box.
What do I need to fix, I am sure it is something I am missing, as I am so new to sendmail and exchange. So help please.