Secondary MX Record

I just recently engaged a secondary, external DR mail service. I have an internal exchange server. I host my DNS on the Peplink Balance 580. I am trying to figure out how to configure a secondary MX record. My domain is My primary mail server is The new DR external secondary mail server address is If someone can give me precise step-by-step, I would appreciate it.
When I try to add it in Network>DNS Settings>Domain Names>MX Records, I get this error:

“Host already defined. Duplicated host is not allowed”


For pointing to external DNS you need to add a dot “.” at the end.
Please take a look at the following Peplink knowledgebase

Charris Lappas

Thanks Jupiter!