What makes a good re-engagement email?

A good re-engagement email does one thing: it gives a subscriber a reason to decide. Stay, or go. Both are fine. The worst outcome is a subscriber who stays on your list but ignores everything you send. That's the one damaging your reputation.

Be honest about why you're writing

Don't dress up a re-engagement email as a regular newsletter. Readers can tell. Be direct: "We've noticed you haven't opened our emails in a while. We don't want to keep your inbox busy if you're not interested." That kind of honesty tends to get a response when everything else didn't.

Remind them what they're here for

People signed up for something. What was it? A discount, a weekly tip, a community, access to something specific. Remind them of that thing. If you've improved since they went quiet, mention it. Don't just say "we've got great content" (everyone says that). Be specific about what's changed or what they'd be missing.

Make the options clear

Give them two real choices. Something like: "Stay subscribed" (big obvious button) and a quieter "Unsubscribe" link below. Some senders also offer a frequency preference option ("hear from us less often"). That can save subscribers who like you but find the volume overwhelming.

Keep it short

This isn't the place for a long newsletter. One short paragraph of context, one reminder of the value, two buttons. If they're disengaged, they're not reading four paragraphs. Give them a quick decision to make.

Watch what you send it from

If you're sending re-engagement emails to a large, cold segment, consider using a separate IP or subdomain. A flood of low-engagement sends to inactive addresses can damage your sending reputation if the segment is large. Worth validating the segment first to catch bounces and risky addresses before they hit the campaign.

And after the campaign, suppress the non-responders. Anyone who didn't open the re-engagement email probably won't open the next one either.