Microsoft Deliverability

Question

I am currently ~35 days into IP warming. Since the start I've had issues with Microsoft. Even when sending ~137 emails a day to highly engaged openers I was marked as spam. Perhaps I moved to quickly with IP warming?I've reeled back to only send to people who opened every email for over 3 months (supposably) before switching email platforms. I'm still being marked as spam. My complaint rate is 0 percent.This is the soft bounce error I keep getting from microsoft in my message activity log:550 5.7.1 {hash}, messages from [a.b.c.d] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol Filter Agent][AGT=PFA][MxId={hash}] [{base64} {hash}:31:50.583Z {hash}]&nbsp;&nbsp;I've reached out to microsoft several times and this is what they get back with:"The connection and throttling limitation against your IP has been set to a more appropriate level based on your reputation.&nbsp;Please note that this does not guarantee that your mail will be delivered to a user’s inbox, only that it will no longer be subject to the previous thresholds unless your IP/domain reputation degrades (or) until it exceeds its revised thresholds."I'm at a loss for what to do. Should I scale way back and start IP warming again from 10 emails?This is my Microsoft SNDS email performance page:

tedscott · Answer

The error and the response do not match.Have you checked your IP(s) to see of they are on any block/black lists?&nbsp; Have you reached out to Braze?