We recently experienced a customer ranges of IPs being blocked at Microsoft, and haven't a clue as to why.
Details are below, but I'm wondering if others are running into the same issue: - Customers IPs are 208.76.62.[83-88]. Understandably, SenderScore isn't the end all be all, but all scores are 97 with the only outlier being 94. Our Google Postmaster tool has reported Green/Yellow for over 120 days. - This customer is a high quality sender who has been making strides toward becoming even that much better by focusing on key deliverability metrics. - We've reviewed this range of IPs via SNDS vigorously. For 89 days of data, there's not a single day where complaints are < 0.1%. Over these 89 days, 6.5 million messages have been sent, and over this time, only 8 trap hits occurred from list attrition. We've had these IPs in their feedback loop since inception and no spike or gradual increase has occurred in this time. - We asked for a reasoning why, and after some stock responses, we received a note back that they could not discuss the matter of the block. We've needed a closer look at this by Microsoft but are at a dead end. I'm asking if anyone here has any avenue we can try to reach out to, or ideas as we need to get insight but haven't got any answers. Thanks, Dickie LaFlamme / Deliverability Specialist / Dyn
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