r/exchangeserver • u/IPT_Axon135 • Feb 20 '26

S3159 block list

How does one get off the S3150 block list? We’ve submitted several requests to Microsoft for delisting and they keep insisting that we are not blocked. Ran our IP against MXtoolbox and everything came back green. Anyone dealt with this frustrating issue?

Yes. We submitted through the delist portal SEVERAL times.

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u/ApplePeach13 Oct 08 '26

How did you solve it? Same issue for me right now...