Should I delete unengaged contacts immediately?

It's tempting to just hit delete and move on. But no, you probably shouldn't delete unengaged contacts right away. There's a smarter sequence to follow first.

Before anything else, understand why inactivity matters. Mailing unengaged contacts hurts your sender reputation over time. Mailbox providers like Gmail and Outlook watch engagement signals closely. Low open rates from a bloated list can quietly push even your good emails toward spam. So doing nothing isn't really a neutral choice.

That said, deleting without trying is leaving money on the table. Some of those contacts are genuinely recoverable. The key is figuring out which ones.

Step 1: Define your inactivity threshold. This varies by business. A weekly newsletter sender might flag anyone who hasn't opened in 90 days. An annual software renewal business might not worry until 12 months of silence. Match the threshold to your normal engagement cycle, not someone else's benchmark.

Step 2: Run a win-back campaign. Send a short sequence (two or three emails, not ten) to your inactive segment. Keep it honest. Something like "We've noticed you haven't been around lately" tends to work better than another promotional blast. Give them a clear reason to re-engage and make it dead simple to unsubscribe if they'd rather go. A genuine "Do you still want to hear from us?" email often gets surprising click activity (of course, only from people who actually want to be there).

Step 3: Suppress, don't delete (yet). After your win-back sequence ends with no response, move non-responders to a suppression list. Stop sending to them. You keep the data for reference, but they're out of your active list and no longer dragging down your engagement rates. This is the right middle ground for most senders.

Step 4: Delete when retention has no purpose. If you have contacts who never engaged from day one, failed a win-back, and have been sitting in suppression for a year or more, deletion makes sense. There's no deliverability upside to holding onto dead weight indefinitely.

One thing worth knowing: some contacts look inactive because of Apple Mail Privacy Protection and similar inbox features that pre-load email content and register false opens. So "zero opens" doesn't always mean zero interest. That's another reason to run a win-back with a click-based call-to-action before making any final calls.

Now if your list feels like it needs a proper health check before you start this process, we clean lists at RME and can flag who's worth keeping ;)