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 websitewelcome.com nameservers. (We use Bluehost for our email)

Reporting-MTA: dns; gateway31.websitewelcome.com
X-Postfix-Queue-ID: 9B5CB2C9D77
X-Postfix-Sender: rfc822; xxx@ourdomain.com
Arrival-Date: Mon,  5 Apr 2021 12:09:51 -0500 (CDT)

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

Thanks

Answer

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.

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

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