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Route Incoming Email

Route Incoming Email

Route Incoming Email

I have installed Sendmail on Centos 7 and want to use it to route all email from the Internet to specific backend mail servers. This is a private hosted platform that hosts multiple domains. I have locked this down so it is not an open relay. I simply want incoming mail addressed to specific domains to go to specific backend mail servers in our hosted environment:

Mail for domain domaina.com to route to internal server mail.domaina.com

Mail for domain domainb.com to route to internal server mail.domainb.com

On the sendmail server I have edited the hosts file with the internal IP addresses of the mail servers mail.domaina.com and mail.domainb.com.

In the mailertable file I have added the following lines:

domaina.com esmtp:mail.domaina.com
domainb.com esmtp:mail.domainb.com

However, when testing mail delivery by connecting directly to the sendmail server externally I can see that mail my mail is being routed to the internet and being delivered using external DNS. How can I get the mail to route to the internal servers rather than via the internet?

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