Did you (or your customer) try contact their support team? Did you sent up SNDS or JMRPP?

There is a link here: https://sendersupport.olc.protection.outlook.com/SNDS/index.aspx

They usually reply within 24 hours.

~M


On 2023-11-28 1:29 p.m., Richard Rognlie via mailop wrote:
Greetings!

I've got a client who recently added a couple of mail servers to their server 
farm
and they cutover to them about 3.5 weeks ago.  One would think that in that 3 
weeks
anyone with warmup issues would have given up by now, but they're still having 
issues
getting mail delivered to hotmail.com recipients.

Can someone from hotmail/outlook reach out to me and I can give you more 
details.

Thanks!
Richard
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