MX records needed for single server?

Hey,

We host ~65 domains on our server and for every one of them I have setup an A record for 'mail.yourdomain.com' and an MX record to point to 'mail.yourdomain.com'.

If email is handled by the same server as www is do I actually need to give every domain an mx record and a mail. record ?

Thanks

 

 

 

 

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