Domain Names/Static IP
Managing, controlling, and support for Custom Domain Names
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Intermitent Status: 5.1.1 (permanent failure) for some senders to our domain

I am having this strange issue with some senders emailing my servers recepeints and on their end they are getting  Status: 5.1.1 (permanent failure). It only happens with senders. 


The comcast sender emails and gets a bounce back email with this:

Reporting-MTA: dns;
Final-Recipient: <>
Action: failed
Status: 5.1.1 (permanent failure)
Some emails from comcast go through even to the same recepients that it fails at times.
Any thoughts, suggestions, advice . Thanks. 
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Official Employee

Re: Intermitent Status: 5.1.1 (permanent failure) for some senders to our domain

Thanks for reaching out to us on our Comcast Business Forums, Integnia_Admin.

I'm sorry that some of the Comcast users are having issues getting through. Have you run a blacklist check on your domain? I usually use MXToolbox to check. Click MXToolbox to visit the site and check for domain issues. If you still need assistance from me, send me a private message with your full name, address and the email your senders are having trouble getting through to. 

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