On 2026-01-27 05:44, Stefano Bagnara via mailop wrote:
We are repeatedly advised to use JMRP and SNDS, but in our experience
they are not helpful. We receive S3150 errors on IPs that have always
been GREEN on SNDS and for which we have no FBL data at all.
I also believe SNDS colors are unreliable and not correlated with
inbox placement (despite the explanations on that site). We have not
been able to establish any relationship between open rates and SNDS
colors.
This is our same frustrating experience we're also trying to remediate.
We have several IP addresses hard-blocked by Microsoft:
550 5.7.1 Unfortunately, messages from [x.x.x.x] weren't sent. Please contact
your Internet service provider since part of their network is on our block list
(S3150).
yet SNDS lists them as green, with a <0.1% complaint rate. Additionally,
SNDS's IP Status shows them as non-blocked, and yet mail is rejected. We
ask them to unlist them, and only receive an automated:
Thanks for your patience while we investigated your request.
Below your IP address(es) and their status(es) are listed.
Not qualified for mitigation
x.x.x.x; x.x.x.x;
The IP(s) above do not qualify for mitigation.
Our customers and their customers aren't able to receive transactional
email, but Microsoft has no interest in actually working to fix their
systems and deliver email. We're left with the only recourse of telling
our customers they need to encourage people not to use Microsoft's
services, which isn't exactly scalable.
I anticipate this is merely yelling into the ether, but in the off
chance there is someone at Microsoft with the capability to make their
systems work, or able to give us *correct* information we can use to
improve our systems we'd love to hear from you.
Michael
--
Michael Brown
Civilized Discourse Construction Kit, Inc.
https://www.discourse.org/
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