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The outbound mail server needs SOME dns, but only to translate the domain name of the mail to the destination IP. Inbound mail is going to need to know an IP address to talk to to get the mail to you. That's what the MX record does, it tells someone else's mail server what IP to connect to, to get the mail TO you.
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I'm gonna be rich and famous, as soon I invent a device that lets you stab people in the face over the internet.
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