Doug Hardie via Postfix-users:
> I used Viktor's collate to trace a specific email handling. There were a
> number of these entries. However, I am only showing 2 of them:
>
This is host mx01.t-online.de[194.25.134.72]:
> Feb 10 03:15:40 mail postfix/smtp[60428]: 4TWjVT5qz7z2gF8w:
> to=<us.ash...@t-online.de>,
> orig_to=<SRS0=YPr1=JS=t-online.de=us.ash...@lafn.org>,
> relay=mx01.t-online.de[194.25.134.72]:25, delay=59371,
> delays=59369/0.02/1.5/0, dsn=4.0.0, status=deferred (host
> mx01.t-online.de[194.25.134.72] refused to talk to me: 554
> IP=47.181.130.121 - None/bad reputation. Ask your postmaster for
> help or to contact t...@rx.t-online.de for reset. (NOWL))
With "smtp_skip_5xx_greeting = yes" (the default) Postfix
will skip to an alternate MX address.
And this is mx03.t-online.de[194.25.134.73]:
> Feb 10 03:20:21 mail postfix/smtp[60525]: 4TWjVT5qz7z2gF8w:
> to=<us.ash...@t-online.de>,
> orig_to=<SRS0=YPr1=JS=t-online.de=us.ash...@lafn.org>,
> relay=mx03.t-online.de[194.25.134.73]:25, delay=59652,
> delays=59651/0/1.4/0, dsn=4.0.0, status=deferred (host
> mx03.t-online.de[194.25.134.73] refused to talk to me: 554
> IP=47.181.130.121 - None/bad reputation. Ask your postmaster for
> help or to contact t...@rx.t-online.de for reset. (NOWL))
>
> I am a bit confused as it appears that the receiving MTA is returning
> a 554 and a 4.0.0 which appears inconsistent. Obviously postfix
> is using the temp failure as it continues to retry periodically.
> From the text, it appears that this should be a permanent failure,
> not temporary. Is the receiving MTA confused or am I?
You can configure this to be permanent. But, as you see, even
different MTAs of the same provider differ in their responses.
Wietse
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