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host mailx.paritaet-bremen.de said: 550 is not allowed to send mail 
from gmx.de (in reply to RCPT TO command)

I don't get what this is about. Some answers here suggest blacklisting, but neither host is on any black list I've searched. Seems like a misconfiguration. If so, who is to blame and how to remedy the situation?

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1 Answer 1

gmx.de has SPF record with -all:

v=spf1 ip4: ip4: ip4: ip4: ip4: ip4: ip4: -all

most likely your recipient's mail server checks this record any denies incoming from your IP according to the record recommendation.

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After some searching, it seems SPF is a bit controversial. Do you have an oppinion whether we should use it on our customers mail server? –  möter Feb 11 '13 at 17:34
Instead of -all use ?all. That way you can consult with SPF but not use it alone to drop incoming mail. –  adamo Feb 12 '13 at 6:44
I don't use it. As for me it brings more mess than fixes problems. But for large services like gmx.de it could be reasonable. Many spamers use their domain addresses in From: of spam messages, so SPF might be of use. And with -all only, if you specify ?all - you loose all the benefit. Yes, it will be more safe, but useless. –  Andrey Voitenkov Feb 12 '13 at 11:16

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