On 2024-02-16 at 15:49:12 UTC-0500 (Fri, 16 Feb 2024 14:49:12 -0600)
Jesse Hathaway via mailop <jhatha...@wikimedia.org>
is rumored to have said:

What is this current attitude on using something like
Postfix's `reject_unverified_recipient`?

ONLY use this when you are relaying for specific domains that you service where you do not have any way to obtain a definitive user list.

Does probing for recipients work these days, is it considered abusive?

Probing for recipients on systems where you do not have explicit prior permission to do so is asking to be treated like a criminal. It also tends not to work.

The same goes for sender verification.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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