What are SNDS and JMRP, and how do they help?

If you're sending to Outlook or Hotmail addresses and you haven't set up SNDS and JMRP yet, you're flying blind on a big chunk of your list. These are Microsoft's free postmaster tools, and they show you exactly how Microsoft sees your sending reputation.

SNDS (Smart Network Data Services) is your IP reputation dashboard. It shows you daily data per sending IP, including email volume, complaint rates, and spam trap hits. Each IP gets color-coded: green means you're fine, yellow means there's something worth watching, and red means Microsoft is already treating your mail with suspicion. Check it at least once a week during normal sending, and daily if you've recently changed your list practices or sending volume.

JMRP (Junk Mail Reporting Program) is Microsoft's feedback loop. When an Outlook or Hotmail user marks one of your emails as junk, JMRP sends you a copy of that message so you can identify who complained and remove them. It works similarly to Yahoo's Complaint Feedback Loop (CFL), just on Microsoft's side of the fence.

Here's what to actually do with the data each tool gives you.

When you check SNDS:

• Green status across your IPs? Keep going, nothing urgent.
• Yellow status? Start digging. Look at which campaigns went out recently. Check if complaint rates are creeping up or if trap hits appeared. Don't wait for it to turn red.
• Red status? Stop sending from that IP until you figure out the cause. A red IP is already being filtered, and sending more volume makes the problem worse, not better.

When JMRP reports come in:

• Remove the complainant from your list immediately. That's non-negotiable.
• Look at the email they complained about. Was it a specific campaign? A specific segment? A certain subject line approach?
• If complaints cluster around a particular send, pause that campaign and investigate before continuing.
• If you're seeing more than 0.1% complaint rates consistently, you have a list quality or targeting problem that tools alone won't fix.

To get set up, register both services through Microsoft's postmaster portal (postmaster.live.com). You'll need to verify that you control the IPs you're monitoring. It takes a few minutes, not hours, and the data starts showing within 24 to 48 hours of registration.

One thing worth knowing: SNDS data is IP-based, not domain-based. If you're on a shared IP (common with most ESPs), you're seeing pooled data that includes other senders. If you're on a dedicated IP, you have a clean view of your own reputation. That context matters a lot when you're reading the numbers. (If you're unsure whether you're on a shared or dedicated IP, your ESP's support team can tell you in about 30 seconds.)

So if you're already seeing red IPs or a flood of JMRP complaints and don't know where to start, our SOS hotline is free and we actually help you work through it.