How do tools like SNDS or Postmaster monitor IP health?

Mailbox providers offer tools that show how they view your sending reputation. These insights are invaluable for monitoring IP health.

Google Postmaster Tools provides:

Domain and IP reputation (high/medium/low)

Spam rate (percentage marked as spam)

Authentication success rates (SPF, DKIM, DMARC)

Encryption (TLS usage)

Delivery errors with reasons

Requires domain verification and minimum volume (typically 100+ messages daily to see data).

Microsoft SNDS (Smart Network Data Services) shows:

IP reputation color codes (green/yellow/red)

Complaint rates

Spam trap hits

Sample spam messages (helps identify problem campaigns)

Requires IP registration to see data.

Yahoo Complaint Feedback Loop: Not a dashboard, but registers you to receive complaint notifications, letting you identify and suppress complainers.

Use these tools to:

Catch reputation drops before they become crises

Identify which campaigns or segments cause problems

Verify authentication is working correctly

Benchmark normal performance to spot anomalies

These tools show your reflection as mailbox providers see it. What you see internally may differ from how receivers perceive you.