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Decode Microsoft SNDS — Understand throttling vs. blocking signals in real time. Check Your Status →

How does Microsoft’s SNDS show throttling vs blocking?

Status colors:

  • Green: Good standing, normal delivery
  • Yellow: Throttling, reduced delivery speed
  • Red: Blocking, significant delivery issues

Data indicators:

  • Trap hits: High numbers indicate list problems
  • Complaint rate: Above threshold triggers issues
  • Filter result: Percentage of mail filtered

Throttling behavior:

  • Mail accepted but slow
  • Deferrals in logs
  • Yellow status

Blocking behavior:

  • Mail rejected outright
  • Bounce messages cite policy
  • Red status
  • SNDS is IP-specific. Check all sending IPs.

Microsoft port authority ratings: green means clear entry, yellow means slow processing, red means cargo hold.

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