A breakdown of the 107K+ companies running Postfix.
Top industries
Information technology and services17K+
Professional and business services11K+
Industrial and manufacturing9.5K+
Art, sports and recreation7.6K+
Construction and building6K+
Education and training5.5K+
Media and telecommunications5.4K+
Retail trade4.4K+
No industry recorded: 17K+
Company size
1–1014,252 (31%)
11–5014,430 (31%)
51–25010,405 (22%)
251–5003,114 (7%)
501–1,0001,362 (3%)
1,001–5,0001,995 (4%)
5,001–10,000450 (1%)
10,001+500 (1%)
Share of companies with a recorded size, by employees.
No size recorded: 61K+
Versions detected
10 versions across the confirmed companies. Counts are distinct companies seen running that version.
3.5.252
3.8.42
2.0.161
2.1.51
2.10.11
2.7.01
2.8.81
3.1.151
3.1.61
3.6.41
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Frequently asked questions
About the Postfix data on this page.
How many companies use Postfix?
Firmable holds confirmed Postfix detections for 107,569 distinct companies, 106,935 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Postfix?
Vital Farms, Penske Media Corporation and voestalpine High Performance Metals are among the most prominent in the current set.
What industries use Postfix?
Information technology and services, professional and business services and industrial and manufacturing lead the set, across 19 industries in total.
What size companies use Postfix?
Adoption concentrates in the 11-50 employee band, across the companies whose size is recorded.
Where are Postfix users based?
The United States, Japan, Canada and Australia account for most detections, across 13 countries.
How current is this data?
106,935 companies were confirmed in the last 90 days. Last detection 14 October 2026.
