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@rysiek I'm not going to try to claim that you're having more delivery problems than you know about, but the number of angry posts I've read from people who are doing all the right technical things with their mail server and DNS that find by chance that they've been blackholed by Google and Microsoft for some time suggests it might be difficult to know whether someone running their own mail server wasnt having deliverability problems.

I'm curious how you know all the mail your server handles is delivered, because that seems like an interesting/fun thing to try to determine without some kind of bounce feedback.