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Microsoft Deliverability during IP warm up



I've been experiencing an issue with Microsoft Deliverability during a new Responsys IP warm up and wondered if anyone had any experience of this/advice to lend?

We've been following a thorough warm up plan for a new IP address and have had no problems with any domains other than Microsoft.

Firstly, we ran into a rate limit, which I then got unblocked from Microsoft.

More recently, we've been seeing bounce rates (just to Microsoft) up and around the 45% mark.

All of the soft bounce replies come back as "x-pmta:all sources disabled".

Has anyone had the same issue before?

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