Multiple mail servers and reverse DNS

leeeennyy asked:

If I have three mail servers MS1, MS2 and MS3 all with different IPs but share the same domain name (exampledomain.com) and I use an SPF record to specify them, how would reverse DNS work on the server receiving mail from any of my mail servers since each of them would resolve to a different IP?
Or would the receiving server have to check against the SPF records instead?

My answer:


Never name your mail servers (or any other server) with the naked domain name. This will break a lot more stuff than forward confirmed reverse DNS lookups.

Each server should have its own unique name which is a subdomain of your domain, and for which the reverse DNS points back to that name.


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