How to handle inactive Email Subscribers: Re-Engage or Remove?

Every email list faces the same problem at some point: a large proportion of subscribers simply become inactive. For us, inactive means that contacts have not opened any emails in the last 5 emails.

Experience shows that, as always, the "80/20" principle applies, but it is usually only < 30% of subscribers who are really active. This usually leads to fewer clicks and a poorer delivery rate in the long term. So the question is always the same: reactivate or remove contacts?

And the simple answer is: both. But in the right order.

First: fewer emails and analyze

When subscribers become inactive, it often goes unnoticed; when it is noticed, many teams panic and launch aggressive re-engagement campaigns. This is usually the wrong first step. Instead, the number of mailings to this segment should be reduced. For example, if you normally send 2 or 3 newsletters per week, you should reduce the number to 1.

Less pressure often leads to better results and a lower unsubscribe rate in these segments. Sending more emails usually increases the number of unsubscribes and damages the sender's reputation.

Inactive subscribers are often overwhelmed, not necessarily disinterested.

If you're unsure how to structure your reactivation logic, segmentation or automations, it's worth having everything checked before you take action.

Book a short initial consultation and we can take a look:

• Your segmentation structure
• Your thresholds for inactivity
• And whether you're losing deliverability or sales without realizing it

Now back to the process.

Step 1: Validate email addresses (especially in B2B)

Before you start a reactivation campaign, validate your email addresses.

We usually use the ZeroBounce tool to filter out the most common problems such as invalid email addresses, hard bounces and risky emails. This is particularly important in the B2B context. In the B2C sector, validation is useful but often not crucial. In B2B, outdated business emails due to job changes are common. Continuing to send these emails is detrimental to deliverability and campaign performance.

Clean up the data first. Then reactivate.

Step 2: Create a targeted reactivation automation

Once your list has been cleansed and the frequency reduced, create a structured reactivation sequence. This will help you win back inactive email contacts.

The approach that has worked best for us:

• 1 email per week
• 4-5 emails in total
• Stronger subject lines (Be interesting, some people would call it clickbait. But not too extreme please)
• High quality content with high click-through probability (e.g. strong discounts or overall very unique and relevant content)

The goal is not to slowly warm up contacts, but to get them to take action so that they open again regularly.

Anyone who opens more than one reactivation email or clicks on at least one of them will be added back to the active newsletter list. Those who remain inactive after the full sequence can be removed from regular marketing campaigns. This reduces costs, protects the sender's reputation and gives a better overall picture of the "strength" of your subscriber base.

Practical example with 500,000 subscribers

We used this process for the large travel company Travador with over 500,000 subscribers. First, we removed contacts with low engagement from the regular newsletter activities, then validated them and deleted all invalid email addresses from the system. We then set up a 5-week reactivation automation. We were able to reactivate around 60,000 subscribers. For us, active means that they have opened at least one of the last 5 emails. But, and this is important, after 2-3 months the activity of some of these reactivated users decreased again.

The reality: Some contacts are simply less active

This example illustrates a "sad" truth. Not every subscriber can be saved in the long term, and some are simply less active than others. However, a smart email marketing agency knows how to deal with this. You can't force engagement either, as this usually has the opposite effect. The better approach is to have a segment that simply receives fewer newsletters.

Conclusion: reactivate or remove?

Reactivating inactive contacts in email campaigns is not an art, but a process. High subscriber numbers look impressive, but inactive contacts distort actual performance metrics such as open and click rates.

Using the system described, you can remove invalid emails and contacts that could not be reactivated at any time. Contacts with low long-term engagement should be contacted less frequently to reduce the number of unsubscribes and protect the sender's reputation. This can also save on license costs.

If you need help with this, please contact us for a free consultation.