Microsoft's free sender monitoring tools: Smart Network Data Services for IP reputation data, and the Junk Mail Reporting Program for complaint feedback.
⚡ Monitored by EmailExacto IntelligenceMicrosoft provides two free tools that give email senders direct insight into how Outlook.com evaluates their infrastructure — equivalent in purpose to Google's Postmaster Tools.
SNDS (Smart Network Data Services) shows the reputation status of your sending IP addresses as observed by Microsoft — traffic volume, complaint rates, and spam trap hits per IP. JMRP (Junk Mail Reporting Program) delivers copies of messages Outlook.com users mark as spam, allowing you to remove complainers from your list.
Both are available at sendersupport.olc.protection.outlook.com/SNDS and require Microsoft account login and IP ownership verification.
SNDS — Smart Network Data Services:
After registering your sending IPs, SNDS provides daily data showing per IP: traffic volume (accepted vs. filtered), complaint rate (colour-coded), spam trap hits, and IP status (blocked / throttled / good).
Complaint rate colour codes: Green (<0.3% — good standing), Yellow (0.3–0.9% — caution), Red (>0.9% — high risk of blocking). Data lags by approximately 24-48 hours.
JMRP — Junk Mail Reporting Program:
JMRP delivers a redacted copy of each message an Outlook.com user marks as junk to an address you register (recipient address removed from the copy). This identifies which campaigns generate complaints and which addresses to suppress.
SNDS is the only authoritative source for your IP's standing at Outlook.com. Third-party tools check public blacklists, but SNDS shows Microsoft's internal assessment — which governs filtering and blocking independently of public DNSBLs. An IP can be clean on all public blacklists and still be red in SNDS due to Microsoft-specific complaint data.
With Microsoft's 5.7.515 hard enforcement active for 5k+/day senders, having visibility into SNDS status before a blocking event — not after — is essential operational hygiene.
EmailExacto monitors the technical signals that feed Microsoft's reputation models — authentication stack, blacklist status, and inbox placement via Outlook/Hotmail seed accounts.
✓Register all sending IPs with SNDS — don't wait until a blocking event.
✓Check SNDS at least weekly. Yellow or red status is a leading indicator of upcoming blocking.
✓Register for JMRP and process complaint feedback — add complainers to your suppression list within 24 hours.
✓Target SNDS complaint rate in the green zone (below 0.3%).
✓Spam trap hits in SNDS indicate list hygiene problems — investigate immediately.
✓Correlate SNDS data with your send calendar to identify which campaigns generate Microsoft complaints.
✓Use SNDS to verify your IP status before scaling send volume.
✓If SNDS shows your IP is blocked despite clean authentication, use Outlook.com Deliverability Support for review.
✓Pair SNDS with the Sender Delisting Portal (sender.office.com) when requesting IP removal.
✓Keep SNDS enrollment updated as you add or change sending IPs.
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