We ALL have that pot of people that:
"We have loads of people we need to tap into and re-engage"
"There's so much opportunity sat there"
Basically, this is bollocks (sorry but not sorry - you need to hear this)
If you run a re-engagement campaign you've just blasted your worst segment
The people in that sequence are, by definition, your least engaged contacts
Gmail, Outlook and Yahoo have been watching them not open or engage with your emails for months and have built a picture.
Then you send them three emails in quick succession. Low opens, because they don't open. Low clicks. LOADS of deletes without opening. Some bounces from dead addresses. And spam complaints, because an email arriving after a long silence feels unexpected (it's been proven people think they have unsubscribed!)
That's a negative deliverability event dressed up as list hygiene.
And it's triggered by a broken metric
The whole thing runs off non-opens, which we know is NOT reliable or an indicator of success
So the segment you're targeting is full of people who've been misclassified
The maths AIN'T mathing...
Typical confirmed re-engagement rate: 3–8%.
So 92 to 97 people in every hundred either ignore you or unsubscribe or worse
You ran a campaign for single-digit retention at the deliverability cost of mailing your worst segment.
What to do instead
→ Stop measuring engagement with opens. Use meaningful actions - website visits, downloads, event registrations, replies, purchases, pricing page views. Any of those in the last 6-12 months and they're not disengaged, whatever their open history says.
→ Build a rolling suppression strategy, not a campaign. 6-9 months of nothing: reduce frequency to your best sends only. 9-12 months: off campaigns, keep for highly targeted sends. 12 months: suppress.
→ If you must send something, send one email. Not a sequence. And it shouldn't ask if they want to stay - that makes them actively choose you at the moment they're least likely to. Just show up with something useful and let their behaviour answer.
The real point
Re-engagement campaigns are pumping water back into a leaking bucket instead of turning up the tap.
Lists lose 20–25% of engaged audience a year. That's normal. Recovering 5% of them costs you a deliverability event. Putting the same effort into acquisition adds people who are engaged from day one, with no reputation risk.
Stop trying to re-engage people who've already left. Start building relationships with people who haven't arrived yet.