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A comment on Helm is a personal server that lives where you do. Parent comment

Re:Helm is a personal server that lives where you do by sneak on Sunday August 29, 2021 @10:52PM (#28352406)
No, SMTP runs on port 25 only. You need an IP per end mailserver if you are not terminating TLS on the multiplexer.

It's not stupid.

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Re:Helm is a personal server that lives where you do by treis on Monday August 30, 2021 @09:25AM (#28355410)
One computer can have multiple ip addresses though. I don't know if it works on AWS or for email but I think it's at least theoretically possible.
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