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Re:Ask HN: Do You Self Host? by chippyty on Tuesday December 05, 2023 @05:55AM (#38529328)
Did you use a turnkey solution like Mailinabox or Ireadmail?
Re:Ask HN: Do You Self Host? by bcx5k15 on Tuesday December 12, 2023 @11:22AM (#38614273)
The problem is around DNS/IP whitelisting

I worked for a large bank and we eventually gave up on it for customer emails because trying to keep your domain/IP ranges in the correct lists so that you didn't end up in spam folders was so operationally expensive