5.x.y SMTP reply codes are permanent errors. It might be a permanent
error because a downed MTA was brought back up before its
configuration was fully debugged. The reply code might be generated
due to the receiving MTA's use of an RBL that is now blacklisting
all queries.
Roman, thank you for taking the time to revisit some of the settled
truths about how automated senders and how they deal with mail
rejection.
--Sandy
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Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
e-mail: sandy(_at_)cypressintegrated(_dot_)com
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