Barracuda Bouncing Emails

I’m not too familiar with all the intricacies of email servers and am curious what you guys think this looks like.
Is the receiving blocking it or is this something on our end?
The receiving company has stated that they have whitelisted our IP and they do not route to any nameservers. (We use Bluehost for our email)

Reporting-MTA: dns;
X-Postfix-Queue-ID: 9B5CB2C9D77
X-Postfix-Sender: rfc822;
Arrival-Date: Mon,  5 Apr 2021 12:09:51 -0500 (CDT)

Final-Recipient: rfc822;
Original-Recipient: rfc822;
Action: failed
Status: 5.0.0
Remote-MTA: dns;
Diagnostic-Code: smtp; 550 permanent failure for one or more recipients
    ( Sender IP reverse lookup rejected)



The Reporting-MTA has tried to send a message to the Remote-MTA which has rejected the message with an error described in Diagnostic-Code.

The error 550 Sender IP reverse lookup rejected is most likely related to SMTP Reverse DNS Resolution which is further related to a Reverse DNS Mismatch test.

Source : Link , Question Author : ImJT , Answer Author : Esa Jokinen

Leave a Comment