Well we first saw the blockage via SNDS's "IP status page" - Blocked due to user complaints or other evidence of spamming.
Here's one of many diagnostic code we received Action: failed Status: 5.0.0 (undefined status) Remote-MTA: dns;mx3.hotmail.com (65.55.92.168) Diagnostic-Code: smtp;550 SC-001 (SNT004-MC3F40) Unfortunately, messages from 208.76.62.88 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors . X-PowerMTA-BounceCategory: other Thanks, [image: Dyn logo, Dyn.com] <http://dyn.com/> <http://twitter.com/dyn> <http://twitter.com/dyninc>[image: Dyn facebook account] <http://facebook.com/dyn> <http://twitter.com/dyninc>[image: Dyn LinkedIn account] <http://linkedin.com/company/dyn> Dickie LaFlamme / Deliverability Specialist +1 603-296-1952 On Tue, Jun 7, 2016 at 1:36 PM, Anthony Chiulli <achiu...@salesforce.com> wrote: > What error code are you receiving back from blocked mail? > > *ANTHONY CHIULLI* > > Senior Consultant, Deliverability Services > > Salesforce > > Mobile: 303.817.6506 > > On Tue, Jun 7, 2016 at 11:26 AM, Dickie LaFlamme <rlafla...@dyn.com> > wrote: > >> 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 >> >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> >> >
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