Donovan Bray:
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> Jul 19 19:25:35 myserver postfix/error[14000]: D075AA21004: to=<
> z...@comcast.net>, relay=none, delay=0.36, delays=0.36/0/0/0, dsn=4.0.0,
> status=deferred (delivery temporarily suspended: host
> mx2.comcast.net[76.96.30.116]
> refused to talk to me: 554imta33.emeryville.ca.mail.comcast.net comcast
> 204.130.140.253 Comcast block for spam. Please see
> http://help.comcast.net/content/faq/BL000000 )
>
> What determines the mapping between the upstream mail servers 554 and being
> registered as dsn=4.0.0 and being treated as a temporary failure.
smtp_skip_5xx_greeting (default: yes)
Skip SMTP servers that greet with a 5XX status code (go away, do not
try again later).
By default, the Postfix SMTP client moves on the next mail exchanger.
Specify "smtp_skip_5xx_greeting = no" if Postfix should bounce the mail
immediately. The default setting is incorrect, but it is what a lot of
people expect to happen.
Wietse
