Your CEO just decided it was time to send more emails. You have segments and even entire lists that haven’t seen an email in months — or years. Ads and organic social aren’t working like they used to, and suddenly, your CRM looks like the opportunity of a lifetime.
Re-engaging dormant email lists can generate pipeline, but doing it incorrectly can destroy your sender reputation and email deliverability. The safest approach is to rebuild engagement gradually and treat dormant contacts as high-risk sends.
Before you do anything, set realistic expectations and keep reading.
Dormant email lists create significant deliverability risk
Just because contacts are in your CRM doesn’t mean they’re safe to send to. The older your list, the more likely you have risky or invalid emails rotting inside.
Also, ISPs like Gmail monitor spikes in email sends and are suspicious of emails from cold or new senders. Even if your email gets delivered, there’s a chance your reader won’t remember you and is more likely to mark you as spam, which hurts your sender reputation.
People who didn’t engage with email before aren’t likely to re-engage. If someone isn’t active on a given channel, you’re going to have a hard time reaching them.
The same principle applies to email marketing. HubSpot calls this graymail and recommends users develop a send and suppression policy accordingly.
Avoid emailing these people. If marketers decide to email these high-risk segments, it should be the very last segment they send to.
Dormant contacts are one of the fastest ways to damage sender reputation and trigger spam filtering.
How to re-engage dormant email lists without harming deliverability
The following seven steps help marketers safely re-engage dormant email lists while protecting sender reputation and deliverability. Numbers 1-4 are unskippable. The rest are optional.
1. Make sure your DNS is configured properly
You need SPF, DKIM and DMARC set up correctly and in that order. If you’ve already done this, the next step is to make sure your DMARC reject policy is set to the appropriate level of strictness.
I use GlockApps to monitor and configure these records, and it takes a lot of the guesswork out of your DNS planning. I highly recommend using this or a similar tool.
2. De-risk your lists
Use an email verifier like Reoon or ZeroBounce to identify emails that are risky, invalid and safe to send to.
These tools aren’t 100% accurate, but they’re a useful proxy for sorting out risky emails without putting your domain on the line.
Any emails flagged as invalid or risky are probably worth suppressing immediately.
The older your list or segment, the more important this step is. One of my clients got all their spam complaints and hard bounces from newsletter and blog opt-ins over a year old. They had zero spam complaints from qualified leads who engaged within the last 6-8 months.
I’ve noticed Reoon runs more MX record checks and flags more emails as risky than ZeroBounce does, which suggests to me it’s probably more reliable. It’s also cheaper.
3. Develop an offer or reason for emailing for each segment
People need a reason to hear from you. Why should they get your emails and why now? What’s in it for them?
Whether you’re launching (or re-launching) a newsletter or offering audits or sharing unique report data, have something valuable to share that is relevant to the segment you’re trying to reach. Don’t skip this step.
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4. Start with the most recent activity first
Look for contacts who opted into forms, recently engaged with emails (1:1 emails included, as long as they’re being sent from the same primary domain) or visited key pages within the last 14-30 days.
If that’s not possible, look for people who engaged within the last 30–60 days.
From there, you can:
- Send them the relevant offer you’ve crafted.
- Set up relevant welcome and nurture flows so that all future opt-ins or replies are immediately handled appropriately.
Speaking of nurture flows, this is the perfect time to ask users to reply, share useful content, ask them to add you as a contact or drag you into the primary inbox folder — whatever tactic makes sense based on which inboxes your contacts use most and what your goals are.
All of these actions signal to ISPs like Gmail that you’re a trustworthy sender, which enables you to send emails to primary inboxes in the near future.
If you’re under pressure to deliver pipeline, you can start with your graveyard of closed/lost deals.
5. Start slow and ramp up based on engagement rates
Aim for contacts who engaged within the last 14-30 days, if you can. Send emails in small batches and aim for human open rates of 25%+.
If your open rates hold, you can gradually ramp up the volume. If not, dial it back until engagement improves. If you don’t have contacts who engaged within the last 14-30 days, the next best window is 30-60 days.
6. Target your contacts on other platforms
There are many ways to do this, but here are two:
- You can enrich contacts in Apollo or Clay with LinkedIn profiles, target them with ads, then follow up with cold outreach. Lemlist sent cold outbound to LinkedIn users who commented on thought-leader ads and achieved a 40% reply rate. Granted, their objective wasn’t to re-engage a list, but it suggests multichannel approaches can work well.
- You can also send cold emails from pre-warmed secondary domains inviting contacts to join you on another list or take advantage of a special offer, like Alex Turnbull does here:
7. Cut the deadweight and build your lists from scratch
I know, I know. This one hurts. But if enough of your list is unmailable, this will protect your domain and sender reputation. If your contacts haven’t heard from you in a year or more and don’t expect to hear from you, it’s wiser not to send them emails from your primary domain.
A better alternative is to place newsletter opt-ins and forms on key pages and in social posts and ads. Yes, it’s slower. But we’re re-entering the age of consent. You want people to give permission and willingly opt in.
Re-engaging email lists safely
Re-engaging dormant lists can work, but only if you approach it carefully. Start with your most recent activity, clean risky contacts from your lists and ramp up slowly based on engagement signals. Protecting your sender reputation now will make it much easier to reach the inbox later.
Key takeaways
- Dormant email lists contain invalid addresses, spam traps and disengaged recipients that can damage sender reputation.
- ISPs monitor sending spikes and engagement signals, making sudden outreach to cold lists risky.
- Marketers should start with recently engaged contacts and ramp sending volume gradually.
- Email verification tools help identify risky addresses before sending campaigns.
- Successful re-engagement campaigns require a clear offer and strong engagement signals.
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