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A comment on How does the Gmail unsubscribe button work?. Parent comment

Re:How does the Gmail unsubscribe button work? by takeda on Friday May 29, 2020 @04:28PM (#23355106)
Not exactly what you mentioned, but if you host your own mail server you can use bogofilter-milter.pl[1] when it detects that mail is a spam it rejects it with a configurable message.

[1] https://stuff.mit.edu/~jik/software/bogofilter-milter/

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