JMRP (Junk Mail Reporting Program) is Microsoft's feedback loop program for Outlook.com, Hotmail, and Live.com. When a recipient clicks "Report as Junk" in Outlook, Microsoft sends a complaint notification back to the sender via JMRP — provided the sender has enrolled.
How JMRP works:
- Sender enrolls at Microsoft's SNDS/JMRP portal and provides a complaint notification email address
- Microsoft verifies ownership of the sending IP range
- When any Outlook user reports a message from those IPs as junk, Microsoft sends a formatted complaint notification to the enrolled address
- Sender uses these notifications to identify problem recipients, remove them from lists, and prevent repeat complaints
Why JMRP matters for deliverability:
Unmanaged complaint rates are invisible without a feedback loop. JMRP makes Microsoft complaints actionable — you can suppress complainers before their complaints accumulate to levels that trigger broader filtering. High complaint rates with Microsoft directly worsen your SNDS status and increase junk folder routing.
JMRP vs. other feedback loops:
- JMRP is specific to Microsoft (Outlook.com, Hotmail, Live.com)
- Google does not offer a traditional FBL — use Google Postmaster Tools for complaint rate monitoring instead
- Many smaller ISPs also offer feedback loops — enroll wherever available
Enrollment: Register via Microsoft's Smart Network Data Services (SNDS) portal. See Microsoft SNDS and Junk Folder.