Secondary Mail Server

Hi All,

Is there a way to have a secondary mail server?

I.E. I currently have two servers, one Virtualmin, and the second is a webmin instance which is currently set up as a secondary DNS server.

After doing some DNS tests, it was advised to have a secondary mail server, and I'm thinking of setting up the webmin server to act as a secondary mail server for the virtual min server.

I have searched around, and have been unable to find any details.