Why your open rate went up when you stopped emailing everyone

In June, a customer we’ll call Hearth & Post asked us to look at their numbers. Opens had slid from 41% to 29% over a year while their list doubled. Their instinct — a reasonable one — was to email more. Ours was the opposite: email fewer people. Six weeks later, opens were at 38% and clicks had recovered too. Here’s what happened, and why it wasn’t a fluke.

The list you have isn’t the list you’re mailing

Every list is really two lists. There’s the group that opens most issues, forwards the good ones, and occasionally replies. And there’s the group that signed up eighteen months ago for a lead magnet, opened twice, and now lets your emails settle to the bottom of the Promotions tab like sediment.

The second group feels harmless. They’re not unsubscribing. They’re not complaining. They’re just… there, padding your subscriber count and quietly wrecking your metrics. Because mailbox providers don’t grade you on how many people you email — they grade you on how the people you email behave.

“Gmail doesn’t know how big your list is. It only knows what happened to the last thousand emails you sent.”

— our deliverability team, at least once a week

When a large share of your sends go to people who never engage, three things compound. Your open rate drops, which is cosmetic. Your engagement signals drop, which is not: providers start routing you away from the inbox for everyone, including your best readers. And your unsubscribe option starts losing to its evil twin, the spam complaint, because disengaged readers can’t be bothered to find the link.

What we actually changed

Hearth & Post didn’t delete anyone. We made one segment — subscribers with no opens or clicks in 120 days — and simply stopped including them in the weekly send. That was 4,509 of their 11,860 subscribers: 38% of the list, gone from the audience overnight.

Then we gave those cold subscribers their own path:

• A three-email re-engagement series over three weeks, sent at a trickle
• A final “should we stop?” email with a single, honest one-click choice
• Automatic archiving for anyone who never responded — recoverable, not deleted

About 9% of the cold segment came back. The rest were archived. Nobody complained, because the people who would have complained were precisely the people no longer being emailed.

The numbers, before and after

Here’s the weekly newsletter, four-week averages either side of trimming the audience:

Metric	Before	After	Change
Audience per send	11,860	7,762	−34.6%
Open rate	29.1%	38.4%	+9.3 pts
Click rate	3.2%	5.1%	+1.9 pts
Spam complaints per 10k	4.1	0.9	−78%
Total unique clicks	379	396	+4.5%

Read that last row again. This is the part people miss: total clicks went up, despite mailing 4,000 fewer people. The clicks were never coming from the cold segment. Removing it cost nothing measurable — and the improved sender reputation lifted inbox placement for the readers who remained.

Try it on your own list

You don’t need to cut 38% on day one. Start here:

1. Define “cold” generously. No opens or clicks in 90–180 days, depending on how often you send. Weekly senders can use 90; monthly senders should use 180.
2. Exclude, don’t delete. Remove cold subscribers from regular sends first. Deleting is irreversible; excluding is a checkbox.
3. Run one honest re-engagement series. Three emails, no tricks. “We noticed you’ve stopped reading — want to keep getting this?” converts better than any fake-urgency subject line we’ve tested.
4. Let the rest go. Archive silently. A smaller list that mailbox providers trust beats a bigger one they don’t.

In EmailFig this whole flow is a saved segment and a three-step automation — the sunset flow template in your dashboard sets it up in about four minutes. But the principle is portable to any tool: your open rate isn’t a vanity metric, it’s a reputation metric. Guard it by sending to people who actually want you there.

Numbers shared with Hearth & Post’s permission. Segment thresholds anonymized slightly; the deltas are real.