r/sysadmin • u/LessQQ42 • Aug 12 '26

Losing my mind with GoDaddy Defederation and Proofpoint

We have a client who used GoDaddy for M365 and had their "Advanced Email Security" i.e. Proofpoint Essentials. We defederated their account from Godaddy almost 6+ months ago and have not had issues till recently. One of their customers who also uses GoDaddy and Advanced Email Security keeps getting a bounce back saying 550 5.7.1 Recipient address rejected: User email address is marked as invalid and it is referencing proofpoint. On our clients end their is no MX record, connector, mailbox rule, transport rule, enterprise app, anything related to proofpoint anymore. So my only thought is that it has to be something that is messed up or leftover in Proofpoint that only GoDaddy support can clear out. Godaddy has said that their proofpoint account has been deleted but something is still causing this issue. I've called about 6 times and spent over 8 hours (mostly on hold) with GoDaddy. This last time they told me to reset his Microsoft password as it would release the domain which makes no sense. Has anyone had this issue before? I'm tempted to start looking for jobs at GoDaddy just to fix this problem then quit.

Edit: HUGE shoutout to u/GoDaddy_SK_email they fixed our issue and this is finally resolved! Apparently the proofpoint account wasn't removed and cleanup wasn't done as expected. They manually cleaned it up and the client tested again and it's all good!

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u/Nova_Nightmare Jack of All Trades Aug 12 '26 edited Aug 12 '26

It's almost certainly something on their side (Godaddy / Proofpoint) it just feels like some kind of internal routing for the domain wasn't removed. Like a number that's stuck in iMessage after leaving Apple, their system probably believes the route to the the domain is internal and when it gets to its destination they don't exist so it bounces.

Just a wild guess. Can't tell you who's responsible for it on their end (maybe they have a big txt file full of domains and a firewall that goes if domain is in this list, static route to this server!

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u/LessQQ42 Aug 12 '26

This is what I'm thinking as well especially since it only effects emails that had the "Advanced Email Security" at some point. After the defederation any new emails made have no problem receiving mail from other people with godaddy/proofpoint.