> On Feb 10, 2024, at 15:55, Wietse Venema via Postfix-users > <postfix-users@postfix.org> wrote: > > 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.
If I am understanding correctly, that means that if I set smtp_skip_5xx_greeting to "no", then postfix would stop after the first 5xx and terminate the email. That seems like it might open up some issues where a provider with multiple MTAs might have one in problem state, but the others working fine. If postfix tried the problem MTA first, the email would never get delivered. Is there a way to configure postfix to drop the email if all the providers MTAs return a 5xx response? -- Doug _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
