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> Today we sent out some mails which were rejected, due to our use of
> postscreen. From my queue:
> 3T26TK1xBDz1tSG 49541 Mon Dec 12 15:47:33 firstname.lastname@example.org
> (host mail.klinikum-bayreuth.de[188.8.131.52] said: 450 4.1.7 <email@example.com>: Sender address rejected: unverified
> address: host mail2.charite.de[184.108.40.206] said: 450-4.3.2 Service currently unavailable (in reply to RCPT TO command))
This is no different than greylisting.
Eventually, the probe will go through (unless the receiver has upper
and lower time bounds for greylisting that are close together, but
that is their problem).