A big list looks good on a dashboard. A clean list is what actually reaches inboxes. If you’ve been collecting subscribers for a while, some of them have stopped reading, a few addresses no longer work, and a handful never really wanted your emails in the first place. Cleaning your list on a schedule is one of the least exciting jobs in a side business, and one of the most useful.
Why a Smaller, Cleaner List Wins
Email providers watch how people react to your messages. Mailchimp’s guide to list cleaning explains that invalid, duplicate and inactive contacts drag down deliverability and sender reputation, and that bounces tell inbox providers your list isn’t well kept. In plain words: every email you send to people who never open it makes it a little harder to reach the people who do.
There’s a money side too. Most email services price by subscriber count, so paying to store contacts who will never read another message is a quiet, recurring cost. Kit, for example, automatically unsubscribes hard-bounced and complained contacts and says they don’t count toward billing. Check how your own service counts contacts before you assume.
Know the Three Kinds of “Dead Weight”
- Hard bounces: the address doesn’t exist or permanently rejects mail. Remove these. Many services do it for you.
- Spam complaints: someone clicked “report spam.” They should never get another email from you, and most services unsubscribe them automatically.
- Cold subscribers: real addresses that simply stopped engaging. Kit, for instance, labels someone cold if they’ve been subscribed for more than 90 days and haven’t opened or clicked in the last 90 days.
The first two are easy. The third needs judgment.
A Note on Open Rates
Don’t treat “opened” as gospel. Since Apple’s Mail Privacy Protection launched in September 2021, the Apple Mail app can load your images, including the tracking pixel, through a proxy, so your email service may record an open even when nobody read the message, according to Litmus. That means a few disengaged people can look active. Clicks, replies and purchases are firmer signals, so weigh them more heavily when you decide who is truly cold.
A Simple Cleaning Routine
- Pick a rhythm. Mailchimp suggests a full clean every few months as a starting point, adjusted by what your bounce and complaint numbers tell you. For a small side-business list, once a quarter is plenty.
- Build a cold segment. Filter for subscribers with no clicks (and no opens) in the last 90 to 180 days, excluding anyone who joined recently.
- Send a short re-engagement email. Be direct: “Still want these emails? Click here to stay on the list.” Offer a preference option if your service has one.
- Wait, then remove. Give people a week or two. Anyone who still doesn’t respond after one or two attempts can be unsubscribed or archived.
- Keep a note. Record the date and how many contacts you removed so next quarter’s clean is faster.
Removing people can feel like going backwards. It isn’t. You’re keeping the readers who want to hear from you and protecting your ability to reach them. If you want the bigger picture on how Gmail judges bulk senders, plrexpert.com has a clear explainer on Gmail’s sender rules.
Do This Today
Open your email service, find the setting or filter for subscribers with no clicks in the last 90 days, and save it as a segment named “Cold – review quarterly.” Don’t delete anyone yet. Just look at the number, then put a 20-minute re-engagement email on your calendar for next week.
More on Totally Relentless
- SPF, DKIM and DMARC in Plain Words: Keep Your Emails Out of Spam
- Email Segmentation Basics: Tags vs. Segments for a Small List
- Why Your Side Business Needs an Email List, Even a Tiny One
