On 2024-02-10 at 18:33:29 UTC-0500 (Sat, 10 Feb 2024 15:33:29 -0800)
Doug Hardie via Postfix-users <bc...@lafn.org>
is rumored to have said:

> 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:
>
> 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))
> 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

No, it is sending a 554 without an extended code instead of a connect greeting, 
which Postfix (reasonably) treats as a temporary failure in the scope of the 
specific message being tried.

> 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?

It's a quirk of Telekom. They reject with 554 at connect when they dislike your 
IP. In my experience, the email address in the rejection message is responsive.

-- 
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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