Picture this: you’ve embarked on your email marketing journey and you see us suited up on the sidelines with our face paint and pom poms and megaphones, ready to cheer you on. Inevitably, as you get cookin’ you’ll come to a crossroads that everyone who practices email marketing comes upon. You’ll find a new subscriber that doesn’t really fit in with the other contacts you have. Maybe that person fits into a different contact category like vendor vs. prospect. Or they have different interests than your other email list subscribers. This is where you will ask yourself, “Should I make another email list for this person?” 

There’s conventional wisdom to answer this question that we’ll explore in this blog post. But first, to cover our bases, we do want to make sure we mention that it is strictly frowned upon in the marketing community to fill your email list with 1) purchased lists from third parties and 2) just anyone in general who did not consent to be on your list. In fact, it’s a violation of the terms of use for email marketing software like Mailchimp. If one of your goals in 2025 is to grow your email list, we have a handy guide that will help you take the guesswork out of list building without risking spammy behaviors. 

Now that our disclaimer is out of the way, back to how many lists should you have? The widely accepted answer in marketing is: One List To Rule Them All. It’s recommended that you keep a single list of contacts for your business, but utilize features within your email marketing tool like segments, groups, and tags to keep contacts organized. 

Of course, there will always be exceptions to these rules, and we’ll be sure to mention that, but first, let’s get into why we recommend one contact list for your business.

Keeping One Email Marketing List Is Logistically Easier

It takes a lot of your time to update and manage multiple email lists. 

As we explain in our Marketing Measurement blog post, you’ll want to schedule time to measure your email marketing efforts and do some cleaning while you’re at it. Email list cleaning includes identifying who has never opened your emails and either unsubscribing them or sending them a final chance. It also includes adding tags to subscribers to remind yourself of their specific interests, products purchased, etc. The same thing goes for grouping subscribers if your email marketing software includes this feature.

Now, imagine that earlier in your email marketing journey, you created multiple email lists as a way to organize your subscribers. That means you need to do all that cleaning we described for every single list you made. Unless you’re one of those people who make cleaning videos on TikTok (if you are, thank you, we are watching them), you probably side with the majority of society that cleaning is a chore, so you don’t want to have to do it in multiples. That’s more of your finite time as a small business owner and leaves more room for error. Let’s say you’re a bookstore owner who decided to create a list for every genre in your shop, so you can sell new books in each genre to subscribers who like those books. Some people may be on multiple lists, but at least your emails feel personalized. Now, imagine you updated a subscriber’s information in one list but forgot to in another. Or even WORSE, imagine a subscriber uses the handy “Update my profile” link at the bottom of your latest email to update their own information– but little do they know, it wasn’t updated in the other lists you’ve organized them into. Now they’ll be left to wonder why the next email they receive from you still has their incorrect information. 

As you can see, using one master email list, and the tagging, grouping, and segmenting features, saves you from a logistical nightmare.

One Email Marketing List is Actually Better For Personalization

The example above where we imagined a bookstore with email lists per genre may have sounded like a great way to personalize your emails to subscribers, but you’ll soon learn that multiple lists work for personalization in the short term, but not the long term.

The beauty of personalization is that there are near infinite possibilities because our customers are cool, interesting people who contain multitudes. So what happens if you want to send a personalized marketing email to a cross-section of your subscribers who meet multiple criteria? If you had multiple email lists, you’d have to duplicate your email multiple times potentially, but you wouldn’t want to send a duplicate email to the same subscriber over and over again, right? 

That’s where segments, tags, and groups come into play. You could send one email to a segment of subscribers who contain certain combinations of tags. For example, your bookstore could tag a subscriber as interested in both fantasy books and romance books and send an email about the newest Romantasy release to that cross-section of people. 

In another example, perhaps your brewery has created a new India Pale Lager. You could send an email announcement twice to your Lager interest list and your IPA interest list, or you could send one email to a segment of your list that contains Lager, IPA, or both as a tag. 

Creating multiple email lists for personalization is a classic example of something that looks like a shortcut, but actually costs you more time in the end.

Maintaining Multiple Email Lists May Cost You More Money

And other technical reasons …

On a practical level maintaining multiple email lists may cost you more money. That’s because the average pricing structure for email marketing software is paying per subscriber, or paying more for each subscriber count “tier” like 0-500, 500-1000, etc. If you are using multiple email lists as a shortcut to organization, with subscribers duplicated across more than one list, you’re paying multiple times for those individuals. 

Another reason is that multiple email lists may increase your risk of penalties enforced by your email marketing software, your email provider (ESPs), and your internet service provider (ISPs). 

Mailchimp, Constant Contact, and their competitors are required by internet service providers and anti-spam organizations to enforce penalties on email senders who practice spammy behavior, including abuse complaints, high unsubscribe rates, and high bounce rates. In addition, your ESP like Gmail, Yahoo, or Outlook is also monitoring for this behavior, as is your ISP. 

If you’re not keeping up on the cleaning and maintenance of your multiple lists, this could lead to high bounce rates and high unsubscribe rates, which damages what’s called your sender reputation. This could lead to your emails going to spam folders, being blocked altogether, and even your email marketing account being suspended. No one wants that!

An exception to this rule

One exception to the one email list rule is the popular tool Constant Contact. This tool actually encourages you to make multiple lists to organize your contacts, because it does not have a grouping feature, and it only measures unique email addresses. So you won’t have to pay twice for adding an email address to multiple lists. Further, when you update information about a subscriber, it updates that information across all lists the subscriber belongs to. 

So, Constant Contact could be a great tool for you if the concept of multiple lists for your subscribers just works better with your organizational style. However, it’s not a perfect tool, so do your research into all of its features and pricing models before you sign up for it. For example, some features that are included in base plans of other email marketing software require an upgrade in Constant Contact and its automation capabilities are not as advanced as others.

Final Thoughts

In conclusion, we’re thrilled you’re even considering this question because it means you’re deciding to prioritize email marketing for your business. Emails allow you to be dynamic, creative, and personalized in your communication with customers, and they come with a slew of benefits from time savings to their powerful return on investment. All we ask is that you consider these ideas when determining your email list organization, so that you have the best chance for email marketing success.