On 9/19/19 20:38, Lyndon Nerenberg via mailop wrote:
Others have hinted at this, but let me call it out explicitly:
Pay attention to the SMTP Enhanced Status Codes
A [45]XX can be graduated by the associated [45].X.X.
Add to the below list, if you get a 550 5.7.1 you need to stop mailing
and look very hard at your customer's list gathering practices. Either
the receiving system's sysadmins or the individual recipient is
intentionally refusing mail from you specifically.
E.g.:
552 5.2.3
552 5.3.4 You sent something too porky for the recipient. That's
*your* fault, not theirs.
452 4.3.1 The entire destination system is out of disk space.
Likely not the recipient's fault.
5XX 5.3.5 The sysadmins running the recipient's mail system are
not top notch. Not the recipient's fault.
550 5.6.9 The recipient is hosted on a server running old software
that fails on UTF8 headers. While they might lose
some of the messages you send their way, this isn't
necessarily an excuse to boot them from the list
outright (unless the majority of your traffic
provokes this failure).
--
Jay Hennigan - j...@west.net
Network Engineering - CCIE #7880
503 897-8550 - WB6RDV
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