A breakdown of the 1.9K+ companies running Mailhardener.
Top industries
Construction and building219
Professional and business services199
Financial services187
Industrial and manufacturing177
Education and training159
Information technology and services151
Not for profit116
Art, sports and recreation98
No industry recorded: 152
Company size
1–10358 (23%)
11–50489 (31%)
51–250494 (31%)
251–500152 (10%)
501–1,00029 (2%)
1,001–5,00044 (3%)
5,001–10,0003 (<1%)
10,001+5 (<1%)
Share of companies with a recorded size, by employees.
No size recorded: 367
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Frequently asked questions
About the Mailhardener data on this page.
How many companies use Mailhardener?
Firmable holds confirmed Mailhardener detections for 1,941 distinct companies, 1,941 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Mailhardener?
Ravensdown, EMJ Construction and Hathaway Brown School are among the most prominent in the current set.
What industries use Mailhardener?
Construction and building, professional and business services and financial services lead the set, across 19 industries in total.
What size companies use Mailhardener?
Adoption concentrates in the 51-250 employee band, across the companies whose size is recorded.
Where are Mailhardener users based?
The United States, Australia, Canada and New Zealand account for most detections, across 13 countries.
How current is this data?
1,941 companies were confirmed in the last 90 days. Last detection 13 October 2026.
