A breakdown of the 243 companies running Self-hosted SMTP.
Top industries
Art, sports and recreation24
Information technology and services24
Professional and business services19
Health and wellness16
Construction and building15
Transport15
Hospitality and travel13
Media and telecommunications13
No industry recorded: 34
Company size
1–1027 (38%)
11–5020 (28%)
51–25010 (14%)
251–5004 (6%)
501–1,0002 (3%)
1,001–5,0007 (10%)
10,001+1 (1%)
Share of companies with a recorded size, by employees.
No size recorded: 172
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Frequently asked questions
About the Self-hosted SMTP data on this page.
How many companies use Self-hosted SMTP?
Firmable holds confirmed Self-hosted SMTP detections for 243 distinct companies, 234 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Self-hosted SMTP?
Surefoot, Joink and The Eye Associates are among the most prominent in the current set.
What industries use Self-hosted SMTP?
Art, sports and recreation, information technology and services and professional and business services lead the set, across 19 industries in total.
What size companies use Self-hosted SMTP?
Adoption concentrates in the 1-10 employee band, across the companies whose size is recorded.
Where are Self-hosted SMTP users based?
The United States, Australia, Canada and Indonesia account for most detections, across 13 countries.
How current is this data?
234 companies were confirmed in the last 90 days. Last detection 1 October 2026.
