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A comment on Gmail having issues. Parent comment

Re:Gmail having issues by maxlybbert on Tuesday December 15, 2020 @09:55PM (#25438507)
The standard says “don’t resend,” it doesn’t say “assume the worst and begin removing user from all systems.” That was the mailing list software’s decision.
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Re:Gmail having issues by shmoogy on Tuesday December 15, 2020 @10:19PM (#25438659)
You generally avoid sending to known bad addresses or your reputation will be destroyed very quickly. The 550 response is (read: was) a clear "you fucked up, this user doesn't exist" prior to this.

I saw someone on Reddit say his SES was suspended for sending tons of bounced emails in a short period of time - it's taken very seriously by ESPs.

E: also user rtx a few comments below

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