Reply to them and provide info on volume by day/week and that you have checked SNDS and the volume is apparently too low to register. I have found that they are really bad with low volume mail servers. Request Mitigation and if that doesn't' work, request Escalation. Just keep responding to them via the ticket. Basically you're playing response roulette and eventually, sometimes, you get the answer/fix you need.
good luck, Tara Natanson On Fri, Sep 4, 2026 at 2:13 PM Jude Gaillot via mailop <[email protected]> wrote: > Hi all, > > I bet you've heard this one before ... > > I run my own mail server on a dedicated host with a single public IP > address, using Fedora 43, postfix, amavisd, and dovecot. I have my own > domain with SPF, DKIM, and DMARC configured. I have a very low volume > double-opt-in mailing list with an unsubscribe link on every message. > > Microsoft added my server to their block list recently for some unknown > reason, meaning I can't email hotmail etc. addresses. > > I submitted their support request, which initially replied that I > qualified for "conditional mitigation," but the block never went away. > If I resubmit it, it now says I don't qualify and offers no way to > contact them. > > I joined their SNDS, but it shows no data because I hardly send > anything. Mxtoolbox shows I'm on no blacklists. My SenderScore is 100. > > The bounce message tells me "hotmail- > com.olc.protection.outlook.com[52.101.194.11] said: 550 5.7.1 > Unfortunately, messages from [104.168.132.247] weren't sent. Please > contact your Internet service provider since part of their network is > on our block list (S3150)." > > That makes me suspect it's some other IP near mine that's at actual > fault. As it's a dedicated hosting service (Hostwinds), only my IP has > anything to do with me. > > Does anyone have any suggestions how to move forward? > > -- > Jude Gaillot <[email protected]> > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop >
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