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A comment on Maddy: Composable all-in-one mail server in Go. Parent comment

Re:Maddy: Composable all-in-one mail server in Go by petre on Sunday November 22, 2020 @02:21AM (#25175668)
T-mobile also requires that you match your forward and reverse DNS and run a webserver with a posting address on the domain in order to whitelist your mail server.
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