Study first
Review the ideas behind the questions
Check the audience before campaign pressure takes over. Focus on who has been contacted recently, who still shows interest, and what should happen before inactive people get another promotional email.
Define inactivity from the sending pattern
Inactive does not mean the same thing for every sender. The definition should fit how often the brand emails people and what engagement signals are available.
- A useful inactive definition depends on how often the audience receives campaigns.
- Engagement can be read from opens and clicks over a chosen period, while privacy and bot effects still need judgment.
- A normal campaign should not treat every quiet subscriber as equally valuable without checking recency and engagement.
In Practice
Match the rule to cadence
For a weekly newsletter, several months without opens or clicks may mean something different than two missed quarterly sends. Start with the actual send rhythm.
Use more than one signal when possible
Clicks, opens, purchases, and recent signup source can change the decision. Do not let total list size hide whether people still respond.
Common mistakes
Using the same inactivity cutoff for every brand and send cadence.
Define inactivity around how often the audience is contacted and which engagement signals the team can trust.
Q&A
Can inactivity be defined without looking at send frequency?
No. A useful definition starts with how often the brand sends and what engagement counts for that audience.
Should total list size decide whether a list is healthy?
No. Engagement and recent contact matter because a large quiet list can create delivery and complaint risk.
Re-engage before you remove the reachable people
Some quiet subscribers can be won back. The re-engagement path should ask for a clear signal of continued interest before the list cleanup decision is made.
- A re-engagement campaign can separate people who still want email from people who should be cleaned up.
- A confirmation link is stronger than another normal promotion because it records whether the person still wants the email.
- People who do not confirm interest after re-engagement should not stay in normal promotional sends by default.
In Practice
Make the confirmation action clear
The re-engagement email should not hide the decision inside a normal sale message. Ask people to show that they still want the email.
Keep confirmed people separate
When people confirm interest, treat that as a stronger permission and engagement signal for future sends than a broad inactive segment.
Common mistakes
Sending the usual discount campaign and calling it re-engagement.
Use a re-engagement message that asks inactive people to confirm continued interest before normal promotional sends continue.
Q&A
Should inactive subscribers get the main promotion before a re-engagement check?
Usually no. Re-engagement should first ask whether they still want to hear from the brand.
What happens after people ignore the re-engagement request?
They should be removed from normal promotional lists so uninterested addresses do not keep weighing down future sends.
Protect active recipients from stale-list risk
A stale list can create bounce, complaint, and reputation problems. The safer path is often a smaller confirmed audience, a slower ramp, or removal before the full send.
- Lists not contacted consistently in the last 12 months need extra caution before a broad send.
- Subscriber lists older than two years are treated as too stale for sending in Campaign Monitor's guidance.
- Commercial email opt-out requests must be honored within 10 business days.
In Practice
Ramp stale lists instead of blasting
If the list has not heard from the brand in a long time, start with recent or confirmed recipients and watch the results before expanding.
Remove confirmed opt-outs before any campaign
A cleanup plan cannot keep unsubscribed people in the send pool while the team finishes re-engagement work.
Common mistakes
Treating an old opt-in as permanent permission for every future promotional send.
Review recency and engagement first, because permission and attention can decay when a list has not been contacted consistently.
Q&A
Can a two-year-old untouched list go straight into a normal sale email?
No. The safer decision is to keep that list out of normal promotional sending and rebuild or reconfirm permission.
Does a re-engagement plan override opt-out rules?
No. People who opted out of commercial email must be kept out within the legal opt-out deadline.