SNDS and JMRP in transition

Microsoft's sender reputation data portal ( Smart Network Data Services , or SNDS) and their ISP feedback loop mechanism (Junk Mail Reporting Program, or JMRP), are undergoing a transition. The SNDS website relaunched in June, 2026, with updated access controls and some changes to what data is shared and how it is shared. I'll likely cover that in more detail at some point in the future. For now,…