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That grumpy BSD guy: Twenty-plus years on, SMTP callbacks are still pointless and need to die
https://bsdly.blogspot.com/2017/08/twenty-plus-years-on-smtp-callbacks-are.html
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email
antispam
fraud in antispam
greylisting
A rarely used legacy misfeature of the main Internet email protocol creeps back from irrelevance as a minor annoyance. You should ask your ...
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