Milter can drop/break *TCP* connections with 421 reply. Be warned that
"unwisely used" it can be a nasty trap in case of false positives making
(misclassified) ham sender repeat sending the message for (5) days.
[Triggered by "problem report" about sending to wp.pl in news:pl.comp.mail ]

http://www.sendmail.org/releases/8.13.0
<quote>
  LIBMILTER: If a milter sets the reply code to "421", the SMTP server
    will terminate the SMTP session with that error.
</quote>

-- 
[pl>en: Andrew] Andrzej Adam Filip : [email protected]
The greatest love is a mother's, then a dog's, then a sweetheart's.
  -- Polish proverb
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