Technology answer

Mailman

322

companies run it, <0.01% of 54,527,857 in the index. Landing 12 Sept 2026.

Hosts: 589 live hosts run it, of 191,809,695 hosts in the index, <0.01%. A host is a website, not a company.

Companies by month

No published series

322 companies is under the publication floor of 1,000, and the fixed panel anchored at 31 Dec 2020 carries 190 of them. A monthly line drawn off that many observations would be noise at the same weight as a line off millions, so this page states the count and its date and publishes no series.

First discovered 11 Oct 2023, last discovered 10 Sept 2026.

Both denominators, and a third

Shares of the same 322each row a different wholelanding 12 Sept 2026

Denominator

Companies

Share

companies in the index

54,527,857

<0.01%

companies running anything in Email Campaigns and Transactional Email

1,887,258

0.02%

companies running anything in Mailing list managers

344

withheld

Three wholes, three shares of one count: a share travels with its whole, never alone. Against the last of them, Mailman is rank 1 of 2 technologies in Mailing list managers.

Open as a segment

322 companies; add a country, a sector or a band on the segment page. Counting is free.

/companies/tech-mailman

Open the segment

Catalogue record

As recorded in the cataloguetaxonomy release tax-2026.10last discovered 10 Sept 2026

Open-source mailing list manager for discussion and announcement lists.

Mailman is a self-hosted mailing list manager for running email discussion and announcement lists. It is developed under the GNU project and used by communities and organizations to manage subscriber lists and message delivery.

Kindproduct

VendorGNU Mailman, list.org

PathMarketing and Advertising > Email Campaigns and Transactional Email > Mailing list managers

Slugmailman

Deploymentself-hosted

Pricingfree

Open sourceyes

First discovered2023-10-11

Last discovered2026-09-10

Taxonomy releasetax-2026.10

One click under this answer

Subcategory answerMailing list managersCompanies running anything in Mailing list managers, 344 of 54,527,857 in the index, and the technologies ranked in it.Category answerEmail Campaigns and Transactional EmailThe category above this one, with its subcategories and the companies in each.CatalogueAll 8,177 technologiesRanked by the companies running them, with the publication gate named and the long tail drawn.