Mail to subdomain need to be redirected to mail server in another domain
We have our BIND server running well. The mail server for our domain works fine too.
Problem came when we need to create a sub domain but the mail server for that sub domain need to be some host in the internet that is not under our domain: 1040249.mail.somewhere.com.
we add an entry like:
subdomain IN A 18.104.22.168
subdomain IN MX 0 1040249.mail.somewhere.com
but it lead to a situation where the mail server for the new subdomain will be:
Does anyone has any clue how to solve this problem??