On 30 Dec 2025, at 15:58, Hetzner Blacklist via mailop <[email protected]> wrote: > As for the S3150 error, that means you have hit the limit allowed for your > IP. If you stop sending to OLC accounts, you can start up again in a few days > and the error will be gone (until you hit the limit again). > > Alternatively, you can fill out their support form and get the standard > denial, and then escalate that, and their team will almost always mitigate > the IP manually, and sometimes even increase the limits. > > Our experience of that: > https://docs.hetzner.com/robot/dedicated-server/troubleshooting/microsoft-blacklist#olc-outlook-consumer > > For the past few years Microsoft has been moving away from S3140 (total > IP/subnet block) and towards S3150 (throttle of IP based on individual > limits).
Thanks all, that’s been very helpful. Form filled in, so now we wait. Cheers! Graeme _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
