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by patmorgan23 924 days ago
It's just like doing bulk mail through a third party, except now you're sending your regular mail through them too.

MX records are used to figure out where to deliver mail so you would leave those pointed at your own mail server, no need to set up any MX record pointed to the 3rd party.

You would need DKIM/SPF, etc for sender verification pointed at the 3rd party.