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Re:Ask HN: Why can't I host my own email? by ehPReth on Wednesday April 27, 2022 @11:51AM (#31181542)
indeed, my ISP only recently closed their open relay for all customers

I remember back in the day having to change your SMTP settings whenever you travelled to whatever the ISP was where you were staying. then you could finally send email from your @homeisp.example email

Re:Ask HN: Why can't I host my own email? by wrycoder on Wednesday April 27, 2022 @06:56PM (#31186852)
If it was only open to their customers, that’s a closed relay, and typical for an ISP.