On Sat, 15 Jun 2024, Jeff Peng wrote:
I think postscreen can block them easily.

I'm looking at the postscreen man page and I don't see anything about mail addresses. Am I missing something?

I do see smtpd_command_filter.  How about if I map MAIL FROM:<badname> to QUIT?

Regards,
John Levine, [email protected], Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly
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