user getting a weird bounce back message?

Ok, ive got two dedicated servers.

lets say server1.domain.com
and server2.domain.com

When trying to send an email from a user on server1 to a user on server2, i get the following bounce back error:

user@userdomain.com
lowest numbered MX record points to local host:
retry timeout exceeded


any idea how i can fix this?

 

 

 

 

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