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Re:PeerTube v5: the result of 5 years’ handcrafting by foobarbecue on Tuesday December 13, 2022 @12:55PM (#33972836)
Ah, my apologies, I jumped to conclusions that you were misusing "greylisting". I've never actually checked if I'm getting greylisted sending to large providers, but I think initial greylisting of new addressses is pretty reasonable.

My mail server (MailInABox) has postgrey enabled by default, greylisting incoming email each time email is received from a new address. I thought that was a little overzealous so turned it off.

Re:PeerTube v5: the result of 5 years’ handcrafting by mschuster91 on Wednesday December 14, 2022 @04:59AM (#33981727)
It might be reasonable, but highly annoying if you run a, say, sign-up double opt-in or an email-based second factor/OTP. Customers don't like waiting an hour or whatever greylisting period, and so as a SaaS operator you are all but forced to go to one of the big e-mail senders like AWS SES because you don't stand a chance otherwise.
Re:PeerTube v5: the result of 5 years’ handcrafting by foobarbecue on Wednesday December 14, 2022 @09:12AM (#33983684)
Ah, darn... I'm starting a web app with email verification now, using my own email server for sending and I didn't consider this. Thanks for the warning. Guess I'm about to find out how bad it is.

Pretty annoying to test for this reliably as well...