If you get a 550 then it did NOT accept the mail. What grandparent is talking ab...

account42 on April 29, 2022 | parent | context | favorite | on: Ask HN: Why can't I host my own email?

If you get a 550 then it did NOT accept the mail. What grandparent is talking about would be the server replying with 250 OK and then neither delivering the mail nor sending a delivery failure notification.