Quote:
Originally Posted by fnd
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If you check the URL in your posted log and look at the various reasons for a 554 code, you will find this one for a blacklisted address:
Quote:
554 IP address is blacklisted
Problem:
A delivery of your email was rejected due to a DNSBL entry of your IP.
Solution;
Contact IONOS to have an incorrect entry checked.
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Basically, it is saying that your IP address has been marked as sending spam. If you open
Blacklist Check and click on Check My IP Address, it should let you know which DNSBL list if any your IP address is found on.