Companies Using Jellyfish

I expected to write about a spam-filtering vendor. Jellyfish turned out to be a hosting default. Our October 2026 crawl finds 95,075 domains whose MX records send inbound mail to jellyfish.systems, and almost every one of them got it the same way: they bought shared hosting from Namecheap, and Namecheap set the records. 38,763 of those domains match a company, and that matched set is what the profile below describes.

A filter nobody chose

Namecheap built Jellyfish in-house. Its November 2021 launch release says a 2020 beta replaced the outside anti-spam provider it used before, and its product page says Jellyfish is free and enabled by default with Shared Hosting, Private Email and Spaceship's Spacemail. There's no price tag and no separate order. I checked whether the records reflect that: of 1,000 random domains on 15 October 2026, 940 still pointed their MX at Jellyfish, and 652 served their website from Namecheap's network, with another 239 behind Cloudflare, where we can't see the origin.

Sales signal: treat this list as a Namecheap shared-hosting list with working mailboxes. The owners didn't evaluate email security, so a pitch that assumes they did will miss.

One reading, and what it leaves out

The usage chart has a single point, October 2026, so there's no growth curve to read yet. Later months won't be a same-domain series either, because the domains we crawl change every month (dead sites out, new ones in) and our detection widens over time. Before cleaning, the count was about 108,000. We removed 12,337 parked, for-sale and gambling pages, 577 of them Namecheap's own parking page, and 828 expired domains serving copies of other shops. What stays includes 2,436 domains with only an "Index of /" listing. That's correct for an MX count: the website can be empty while the mailboxes work.

"Jellyfish has more domains than Mimecast, Barracuda or Proofpoint in our table, and almost none of its owners chose it. It arrived with a hosting plan." - Elif Arslan, CMO & Co-founder at TechnologyChecker.io

Sales signal: about 1.26% of the clean set still carries gambling-style titles, mostly lapsed business domains re-registered on Namecheap. Filter titles before you load a sequence.

Who the owners are

Small and young. 66.74% of matched companies with a known size have 1 to 10 staff and 90.10% have 50 or fewer; 80.35% were founded in 2010 or later. Only 3.39% predate 1990. The geography is the surprise. The United States leads with 9,615 matched companies, but India, Pakistan, Bangladesh and Sri Lanka together hold 5,980, and Nigeria, Ghana, Egypt and Kenya hold 4,486. The larger names fit that map: Ha-Meem Group and Al Karam Towel Industries in South Asia, Adron Homes, Dairibord and the Lagos Waste Management Authority in Africa. 239 matched companies have more than 1,000 staff; for them Jellyfish filters one domain's mailboxes, a narrower thing than a group-wide security decision.

Sales signal: this is one of the few email-security lists where South Asia and Africa are core markets, not a tail. Price and payment options matter more here than feature depth.

Industries: the web trade buys its own hosting

IT services leads at 6.93%, and with advertising, business consulting, technology and software development the top five reach 21.85%. No other industry passes 2.7%. That reads like agencies, freelancers and consultants who buy hosting themselves, plus a long tail of every kind of small business they build sites for.

Sales signal: the agency slice is the useful one. An agency that hosts client sites on Namecheap decides the mail setup for every client it builds for.

Switching: a hosting move with a filter attached

One switching flow passes our tests: 28 domains moved their MX from MailChannels to Jellyfish since March 2026, 9 of them in the last 30 days, and none went the other way. I looked at the 28. Nineteen now use Namecheap's hosting nameservers and five use Cloudflare's. These owners moved their site and mailboxes to Namecheap, and the filter changed because the host did. Exits tell the same story from the other side. 10,259 domains dropped Jellyfish since 16 March 2026; of the 10,056 that left on every hostname, only 224 now point their MX at Microsoft 365 and 113 at Google Workspace.

"When a domain leaves Jellyfish, it is almost never because the owner picked a better spam filter. The site moved, or the domain lapsed." - Elif Arslan, CMO & Co-founder at TechnologyChecker.io

Sales signal: win-back and displacement plays built on filter quality don't fit this list. Hosting migration offers do, and the 337 leavers now on Microsoft 365 or Google Workspace show the upgrade path that does happen.

The stack around it

WordPress runs on 51.1% of clean domains and Elementor on 23.77%. Google Analytics is on only 28.85%, against 63.27% on Barracuda's domains, which fits owners who set a site up and leave it. Google Workspace (0.63%) and Microsoft 365 (0.41%) look tiny, but both of our signals read the MX record, and here the MX points at Jellyfish, so they can't show.

Sales signal: WordPress plugins, site care and managed WordPress offers match this base far better than an enterprise mail product.

What Namecheap says, and what we see

Namecheap's Jellyfish page claims 5M users protected. We count 95,075 domains. Both can be right: users are mailboxes, and Private Email domains, which Jellyfish also filters, point their MX at privateemail.com and sit outside this count. On Namecheap's own profile those MX records are counted under hosting. The category table's top row needs a similar caveat: it's labelled Microsoft Defender but reads ppe-hosted.com, which Proofpoint's Essentials setup guide lists as its MX host.

Sales signal: size Namecheap's mail footprint from both signals, Jellyfish MX for hosting and privateemail.com for paid mailboxes, before you quote a number to anyone.

Key takeaways

1. 95,075 domains after removing 13,165 parked, for-sale, gambling and copied-store domains; 12.38% of Email Security, second of 12.

2. Jellyfish comes with Namecheap shared hosting by default, and 940 of 1,000 sampled domains still use it.

3. Small, young and global: 66.74% have 1 to 10 staff, 80.35% were founded since 2010, and South Asia plus Nigeria, Ghana, Egypt and Kenya outnumber the US.

4. Switching follows hosting moves: 28 domains came from MailChannels, mostly onto Namecheap nameservers.

How to use this list

Filter out gambling titles and empty sites first, then segment by country and by agency versus end business. For the full list of 95,075 Jellyfish domains with company, size and stack data, explore TechnologyChecker.io. Our guide to technology detection methods explains why a DNS record and a page script measure different things.