What Hostname to keep for Ideal Mail Delivery

Hello everyone...

I'm going on a bit of confusion... Can you suggest in general case, what should we keep as out VPS Server's Hostname for a mulch-domain hosting ?

for eg: I have my domain name as domain.com. Should I have my VPS hostname **as domain.com or something like **srv.mehargags.com ?

I'm asking this in the context of Email Delivery and other Authenticity checks that are done for IP's and Mailhosts.

I have one of my server's hostname set = domain.com but then I find that server isn't able to route mail to its own domain name with : exim -bt account@domain.com.

Or is there a better way to configure the mail routing to this particular domain ?

Pls suggest.

http://ift.tt/1dvHQ0Z