We count 263,367 companies using Mailchimp as of 30 October 2026. Two in three of them are on the list because of one line in their domain’s email settings, a line Mailchimp’s own setup guide doesn’t ask for. The rest show Mailchimp on their website: a newsletter signup form, or the script a Shopify or BigCommerce store loads when it connects. By industry they look like the average organisation we track, with two exceptions that stood out elsewhere: far more charities and other .org sites than usual, and a strong lean towards the Netherlands rather than Germany.
- Mailchimp speaks of “millions of customers” but gives no current figure and doesn’t say how it counts them. Ours is the 263,367 companies where Mailchimp can be seen from outside.
- Two-thirds of the list rests on an SPF line naming Mailchimp’s servers. It shows the domain allows Mailchimp to send for it; it can’t show the last time anyone did.
- Mailchimp companies are three times as likely as the average company to have a .org website. Amnesty International, AARP and Feeding America are among the best known.
- Dutch companies use Mailchimp about four times as often as our average; German companies 60% less often.
- Most companies that send through Mandrill, Mailchimp’s paid add-on for transactional email, show no other sign of Mailchimp. They aren’t in this count.
How many companies use Mailchimp?
We have found Mailchimp on 263,367 companies. Mailchimp’s about page talks of “millions of customers around the world” and notes that Intuit bought the company in 2021. Neither Mailchimp’s nor Intuit’s pages give a current figure or say how “customers” is counted, so I can’t line the two numbers up. Ours counts organisations with a domain where Mailchimp leaves a trace we can check. The total is refreshed every Wednesday; the breakdowns below are from 29 October.
| Evidence | Share of the list | What it means | Used in the figures below |
|---|---|---|---|
| A line in the SPF record | 65.4% | The domain’s email settings authorise Mailchimp’s servers to send as the company | Yes |
| Mailchimp signup form or form code | 25.2% | A newsletter signup form built in Mailchimp, or its form script, on the page | Yes |
| Mailchimp’s site script | 7.2% | The script a store loads when it connects to Mailchimp, usually from Shopify or BigCommerce | Yes |
| Preconnect hint only | 2.2% | The page tells the browser to get ready to load Mailchimp, and the latest crawl found nothing stronger | No, still in the total |
| Older detections | 236 rows | 236 rows no check has confirmed since July | No, still in the total |
Two kinds of row are treated differently. On 5,749 sites the latest crawl found only a preconnect hint on the page, a line telling the browser to get ready to load something from Mailchimp, which is too weak to call a customer. Because we keep one record per company and a page signal wins over DNS, a few hundred of those sites also carry Mailchimp’s SPF line and are left out for now; fixing that is on our data backlog. And 236 older detections haven’t been confirmed by any check since July. Both groups are still in the total, but I leave them out of every other figure on this page, the first rows of the list and the new customers, which all rest on the remaining 260,605 rows.
A line in DNS that Mailchimp’s guide doesn’t ask for
This is the part of the Mailchimp list I didn’t expect. 174,409 companies are on it because their SPF record, the public list of servers allowed to send email for a domain, includes servers.mcsv.net, which is Mailchimp. Yet Mailchimp’s own guide, Set Up Email Domain Authentication, says that “for manual setup, email domain authentication with Mailchimp still requires you to add 2 CNAME records and 1 TXT record”. Those are DKIM and DMARC records. When I read the page on 29 October, the only place the word SPF appeared was the title of a link to one domain registrar’s help article.
So who adds it? My guess is three kinds of people: admins who were told years ago that every sender belongs in SPF, IT firms who add it by habit when they set up a client’s domain, and anyone following one of the many older guides that still say to. We keep finding new ones. Of the 48 new Mailchimp customers we spotted between 6 and 29 October, 30 arrived through this line.
Here is how I’d read it. The line proves the domain gives Mailchimp permission to send as it. It doesn’t prove a campaign went out last month, and nothing removes the line when an account closes: it can outlive the account by years. For the quarter found by a signup form on the website the picture is fresher: that form is live on the page today, or was when we last looked.
Why the best-known names come through DNS
The line matters most at the top of the list. A company found by the SPF line is about seven times as likely as one found by a signup form to rank anywhere in Tranco’s million most visited sites (11.3% against 1.55%). Among the Mailchimp companies Tranco puts in its top 100,000, 2,845 of 2,992 had nothing but the SPF line on our latest check. Spotify, Zoom, ESPN and Eventbrite are in that group.
I checked that this isn’t just us failing to read big websites. In one alphabetical slice, 46 of the 47 SPF-only companies in Tranco’s top 100,000 had other software detected in their page code, so we did read their pages and found no Mailchimp there. And the two groups barely overlap: of 1,721 signup-form sites checked, only 2 also had the SPF line. My guess is that sites like these keep newsletters off the homepage or run them through other tools today; what we can say is that their domain still names Mailchimp as an allowed sender.
Forms, stores and DNS: three different crowds
How we found Mailchimp turns out to say a lot about who the company is. Signup-form sites are mostly consumer businesses and services: half sell only to consumers, and hotels, venues and travel firms are about twice as common among them as across our database (63 of the 254 we could classify). Store-script sites are almost all shops. The SPF group is the odd one: twice the usual share of subscription software firms, and, among sites we could read, careers pages nearly three times as often as average. My reading is that these are organisations with someone looking after email settings.
| SPF line | Signup form | Store script | All companies | |
|---|---|---|---|---|
| Sells software by subscription (SaaS) | 16.3% | 3.4% | 1.1% | 8.3% |
| Runs an online shop | 31.9% | 38.5% | 96.1% | 30.4% |
| Sells a service | 46.7% | 56.3% | 2.2% | 58.2% |
| Sells only to consumers | 35.6% | 51.3% | 69.8% | 48.4% |
| Sells only to businesses | 23.1% | 11.2% | 2.6% | 15.7% |
| “Buy” is the main button | 41.2% | 47.4% | 89.8% | 39.0% |
| “Start a trial” is the main button | 6.4% | 2.2% | 3.9% | 14.7% |
The store group is worth a separate note for anyone selling to merchants. In our other-software sample, 56% of store-script sites run Shopify and 19% BigCommerce. The script is there usually because the store has connected Mailchimp to its order and product data.
Mandrill: Mailchimp customers who don’t look like it
Mandrill is the transactional side of Mailchimp, the receipts and password resets an app sends one at a time. We track it as its own tool, and it explains a gap in this list. Mailchimp’s pricing page for Transactional Email says it is an add-on to the Standard and Premium plans and that you need a Mailchimp account. So a company sending through Mandrill should, in principle, be a paying Mailchimp customer.
I read two alphabetical slices of our Mandrill list in full, domains from b to bm and from p to pm: 8,155 companies. Every one of them is a company whose SPF record names Mandrill; none was found from its website. Only 1,156 of them, 14%, show Mailchimp evidence of the kinds this page uses, and the share is about the same in both slices; another 12 show only a preconnect hint. The other 86% have no Mailchimp row at all, so they are not on this list or in its total. From the other direction, about 6% of Mailchimp companies also have Mandrill, roughly 14 times the rate across our database.
Two caveats before anyone adds those companies to a Mailchimp campaign. An SPF line can sit in DNS long after anyone last sent through it, and I can’t date these. And a product team sending password resets may never touch Mailchimp’s marketing tools. I’d treat Mandrill as its own audience: software teams with an app that emails its users.
What kinds of organisation use Mailchimp?
Sort Mailchimp companies by industry and you get almost the same shape as our whole database. Shops stand out at 1.4 times their usual share and healthcare falls short; everything else is close to normal, a flatter spread than our HubSpot or Stripe lists show. My reading is that this suits a tool so many organisations pick as their first email service, whatever they do.
| Industry | Mailchimp companies | All companies | Compared with all companies |
|---|---|---|---|
| Ecommerce and retail | 28.0% | 19.9% | 1.4x |
| Professional services | 16.4% | 18.8% | about average |
| Hospitality and travel | 11.9% | 12.4% | about average |
| Media and content | 10.6% | 12.0% | about average |
| Healthcare and life sciences | 8.7% | 12.8% | 30% less likely |
| Education | 5.9% | 5.5% | about average |
| Financial services | 4.6% | 4.4% | about average |
| Marketing and sales tech | 4.0% | 4.1% | about average |
| Software and SaaS | 2.7% | 2.8% | about average |
| Operations and logistics | 2.5% | 2.1% | 1.2x |
| Developer tools | 2.1% | 1.6% | 1.3x |
Where the charities show up
Because our industry labels miss non-profits, I looked at domain names instead. 7.4% of Mailchimp companies have a .org or .org.uk-style address, three times the 2.2% across our database. Signup-form sites and the SPF group are the same on this (8.2% and 7.9%); store-script sites almost never have a .org address. The best-known names on the list say the same thing: Amnesty International, AARP, Feeding America, Charity Navigator, the Pew Research Center, the Poetry Foundation, and open-source foundations such as OWASP and Eclipse.
I also counted domains containing words like “club”, “church” or “festival”. The numbers were too small to publish with a straight face.
The one feature Mailchimp companies have less often than average is a free trial, 60% less. That fits: most of them sell a service, a product or a cause, not software you can try.
Where are Mailchimp customers based?
We know the country for about one in seven Mailchimp companies. The US and UK come out close to their share of our comparison sample, though that sample is small. The gaps are in Europe. The Netherlands is about four times its share of our database; Germany is 60% below its share, and France half. Belgium and Australia sit above average too, but Australia’s “about 4x”, like the Netherlands’, rests on fewer than ten comparison companies.
For the Dutch and German results a second measure backs that up. Website addresses ending .nl are about four times as common among Mailchimp companies, and .de addresses about 60% less common, matching the countries read from company websites. My guess for Germany is a mix of strict data-protection habits and strong local rivals hosted in the EU; I can’t prove that from our data.
| Country | Share of Mailchimp companies with a known country | All companies | Compared with all companies |
|---|---|---|---|
| United States | 32.8% | 31.6% | about average |
| United Kingdom | 12.2% | 13.0% | about average |
| Netherlands | 9.1% | 2.1% | about 4x |
| Australia | 5.6% | 1.6% | about 4x |
| Canada | 5.6% | 5.4% | about average |
| Germany | 4.6% | 11.9% | 60% less likely |
| Belgium | 4.1% | 3.1% | about 1.3x |
| Switzerland | 3.3% | 2.8% | about 1.2x |
| France | 2.8% | 6.0% | 50% less likely |
| Spain | 2.8% | 2.6% | about average |
What else do Mailchimp customers use?
WordPress is the most common companion, on 59% of signup-form sites, because the form usually sits in a WordPress page or plugin. The SPF group runs office email: nearly half have Microsoft 365. Across the whole sample, Mailchimp companies are also far more likely than average to authorise other senders, SendGrid six times and HubSpot three times as often.
| Software | Share of Mailchimp companies | SPF line | Signup form | Store script | Compared with other companies |
|---|---|---|---|---|---|
W  | 45.5% | 43.8% | 59.4% | 7.2% | 1.4x |
M  | 40.1% | 47.7% | 25.3% | 28.3% | 2.3x |
G  | 31.6% | 36.2% | 20.3% | 33.7% | 2.1x |
F  | 13.2% | 11.8% | 15.3% | 16.9% | 2.4x |
W  | 8.6% | 7.6% | 11.8% | 5.4% | 2.0x |
S  | 7.4% | 4.0% | 2.7% | 56.0% | 2.1x |
M  | 6.1% | 8.5% | 1.3% | 3.6% | about 14x |
S  | 6.3% | 8.8% | 1.6% | 1.8% | 6x |
H  | 4.5% | 6.5% | 1.1% | 0.0% | 3x |
S  | 3.4% | 3.7% | 3.6% | 0.0% | 30% less likely |
K  | 2.2% | 2.6% | 0.3% | 6.0% | 1.9x |
C  | 2.1% | 3.0% | 0.3% | 0.0% | about 10x |
W  | 1.7% | 2.5% | 0.0% | 1.2% | 80% less likely |
Two website builders that keep Mailchimp out of sight
Mailchimp companies are 80% less likely than average to run Wix and 30% less likely to run Squarespace. Both builders sell their own email campaigns inside the editor, so a business on Wix has less reason to sign up for Mailchimp, and when it does, the signup form may sit inside the builder’s own widget where we can’t see it. Shopify goes the other way, at about twice the average; more than half of those Shopify companies (93 of 169) are in the store-script group.
About 2% of Mailchimp companies also show Constant Contact, around ten times the usual rate, nearly all in the SPF record. My guess is that two marketing senders in one record often means one was added for a trial or a migration and nobody tidied up. Mailchimp companies run Klaviyo at about twice the average too, mostly companies whose Mailchimp evidence is the SPF line, with Klaviyo’s script on their shop (38 of 50); our list of companies using Klaviyo covers them.
How does Mailchimp compare with other email marketing tools?
Among the email marketing tools below, Mailchimp is on more companies than any other, about 41% of all the detections in the chart.
One warning about the bars: each tool leaves different traces, and I haven’t measured how much of each rival’s count comes from DNS against page code. So the chart ranks visibility from outside. It isn’t a market-share table.
How many companies start using Mailchimp each week?
Since 6 October 2026 our re-checks have turned up 0 new Mailchimp customers. A company counts when Mailchimp appears on a domain where an earlier check had not found it, though some are domains we checked for the first time. Preconnect-only hits are left out of this count, though they are in the total. We start on 6 October because a full re-scan at the end of September made thousands of old detections look new.
Treat the weekly bars as a measure of our checking, not of Mailchimp’s sales. DNS records are re-checked about once a month and many were last read at the end of September, so a new SPF line can take weeks to show up, and a business that launched with Mailchimp already in place usually reaches us as an existing customer rather than a new one.
Putting the Mailchimp list to work
- Email agencies and freelancers. The signup-form group is mostly consumer brands and service firms already gathering subscribers, which may want help turning a list into revenue.
- Fundraising, events and membership software. About 7% of Mailchimp companies have a .org address, three times the norm.
- Apps for Shopify and BigCommerce stores. The store-script group is nearly all shops that, as far as we can tell, have linked their store to Mailchimp.
- Rival email platforms, with the Netherlands and Belgium as obvious places to start.
On Pro you see the whole list and can narrow it by industry, country, business model and how we found Mailchimp, so you can keep only the signup-form sites or leave out the SPF-only companies, and you get a weekly email of new ones. Pro includes 100,000 downloads a month and Business 1,000,000. Try either for 7 days with no card; the trial includes 1,000 downloads.
If you work in Claude Code, add our MCP server with this command:
claude mcp add --transport http agentdata https://mcp.useagentdata.com/mcpThe first time, Claude Code asks you to sign in to your AgentData account. After that you can ask, for example, for Mailchimp customers in the Netherlands.
How we built this list
Our crawler visits each company’s homepage and a handful of its public pages, and looks up its DNS. Any one of these signals puts Mailchimp on a company, strongest first:
- A Mailchimp signup form, or Mailchimp’s form code, on the page
- Mailchimp’s site script, loaded from
chimpstatic.com, usually by a connected store - An SPF record that includes
servers.mcsv.net, labelled “SPF record” in the list (about two-thirds of all rows) - A Mailchimp iframe in the page (one company)
Two more kinds of row are in the total but left out of every figure on this page, the first rows and the new customers: sites where the latest crawl found only a preconnect hint to Mailchimp, and 236 older detections no check has confirmed since July. A later data fix will take them out of the total too.
The evidence mix and the best-known companies come from every Mailchimp row we held on 29 October 2026, read in alphabetical batches; shares in the evidence table are of all 266,590 rows. Profiles, industries, countries and the Mailchimp side of the domain-ending figures come from one company in 32, chosen by a hash of the domain name. Software used alongside comes from a second sample spread evenly through the database, which also supplies the domain-ending baseline. Comparisons are with samples of every company profile we hold. The total, the new customers and the email-tool chart are refreshed weekly, on Wednesdays. Mailchimp’s own words, quoted above, come from its about, setup and pricing pages as they read on 29 October 2026.