A breakdown of the 241 companies running OpenSMTPD.
Top industries
Information technology and services64
Professional and business services19
Media and telecommunications15
Art, sports and recreation13
Education and training12
Industrial and manufacturing11
Financial services8
Construction and building6
No industry recorded: 67
Company size
1–1041 (32%)
11–5039 (31%)
51–25017 (13%)
251–50010 (8%)
501–1,0003 (2%)
1,001–5,0008 (6%)
5,001–10,0004 (3%)
10,001+5 (4%)
Share of companies with a recorded size, by employees.
No size recorded: 114
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Frequently asked questions
About the OpenSMTPD data on this page.
How many companies use OpenSMTPD?
Firmable holds confirmed OpenSMTPD detections for 241 distinct companies, 241 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use OpenSMTPD?
Bird, Badger Mutual Insurance Company and Profectus Group are among the most prominent in the current set.
What industries use OpenSMTPD?
Information technology and services, professional and business services and media and telecommunications lead the set, across 19 industries in total.
What size companies use OpenSMTPD?
Adoption concentrates in the 1-10 employee band, across the companies whose size is recorded.
Where are OpenSMTPD users based?
The United States, Canada, Australia and Singapore account for most detections, across 13 countries.
How current is this data?
241 companies were confirmed in the last 90 days. Last detection 14 October 2026.
