Microsoft rejecting email from disroot

Microsoft’s is rejecting emails this morning, generating the same error as noted previously in this problem.

    said: 550 5.7.1 Unfortunately, messages from [] werent sent.
    Please contact your Internet service provider since part of their network
    is on our block list (S3140). You can also refer your provider to
    [] (in reply to MAIL
    FROM command)

There’s nothing obvious listed against on I don’t know what else to do except report it here.


We have been trying to get any response from microsoft and this is what we got:


As previously stated, your IP ( do not qualify for mitigation at this time. I do apologize, but I am unable to provide any details about this situation since we do not have the liberty to discuss the nature of the block.

At this point, I would suggest that you review and comply with’s technical standards. This information can be found at

We regret that we are unable to provide any additional information or assistance at this time.

Best regards, Deliverability Support

So basically “We blocked you, won’t tell you why. Have a good day”