Postmark
Postmark provides transactional email delivery for web apps with minimal setup time and maintenance.
Market Share of Postmark
Current Customer(s)
230
Market Share (Est.)
2.90%
Ranking
#10
Top Competitors and Alternatives of Postmark
The top three of Postmark’s competitors in the Email Deliverability category are Litmus with 34.97%, SquirrelMail with 13.16%, SocketLabs with 9.59% market share.
| Technology | Domains | Market Share (Est.) | Versus page |
|---|---|---|---|
| Litmus | 2771 | 34.97% | Postmark vs Litmus |
| SquirrelMail | 1043 | 13.16% | Postmark vs SquirrelMail |
| SocketLabs | 760 | 9.59% | Postmark vs SocketLabs |
| Email On Acid | 594 | 7.50% | Postmark vs Email On Acid |
| SparkPost | 412 | 5.20% | Postmark vs SparkPost |
| PowerMTA | 296 | 3.74% | Postmark vs PowerMTA |
| WhatCounts | 252 | 3.18% | Postmark vs WhatCounts |
| DataValidation | 247 | 3.12% | Postmark vs DataValidation |
| MasterBase | 247 | 3.12% | Postmark vs MasterBase |
| Mailtrap | 180 | 2.27% | Postmark vs Mailtrap |
| Pepipost | 170 | 2.15% | Postmark vs Pepipost |
| SMTP2GO | 147 | 1.85% | Postmark vs SMTP2GO |
| Netcore Email API | 122 | 1.54% | Postmark vs Netcore Email API |
| 250ok | 101 | 1.27% | Postmark vs 250ok |
| SMTP.com | 80 | 1.01% | Postmark vs SMTP.com |
| BriteVerify | 61 | 0.77% | Postmark vs BriteVerify |
| turboSMTP | 60 | 0.76% | Postmark vs turboSMTP |
| eDataSource | 35 | 0.44% | Postmark vs eDataSource |
| EmailDelivered | 19 | 0.24% | Postmark vs EmailDelivered |
| CritSend | 18 | 0.23% | Postmark vs CritSend |
Popular Comparisons
Top Competitors and Alternatives of Postmark
The top three of Postmark’s competitors in the Email Deliverability category are Litmus with 34.97%, SquirrelMail with 13.16%, SocketLabs with 9.59% market share.
Postmark vs Litmus
Postmark vs SquirrelMail
Postmark vs SocketLabs
Postmark vs Email On Acid
Postmark vs SparkPost
Postmark vs PowerMTA
Postmark vs WhatCounts
Postmark vs DataValidation
Customers of Postmark
Around the world in 2026, over 229 companies have started using Postmark as Email Deliverability tool.
| Customers | Employee Range | City | Region | Country | Social Links |
|---|---|---|---|---|---|
| Huawei Technologies | 10,000+ | Shenzhen | Guangdong | People's Republic of China |     |
| Sage | 10,000+ | Newcastle upon Tyne | England | United Kingdom | |
| IKEA | 10,000+ | Delft | South Holland | Netherlands | |
| StarTek | 10,000+ | Denver | Colorado | United States | |
| Barracuda | 10,000+ | Campbell | California | United States | |
| DronaHQ | 10,000+ | Mumbai | Maharashtra | India | |
| Upwork | 10,000+ | San Francisco | California | United States | |
| Koch | 10,000+ | Wichita | Kansas | United States | |
| Baxter International Inc. | 10,000+ | Deerfield | Illinois | United States | |
| Cimpress | 10,000+ | Dundalk | Maryland | United States | |
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Postmark Customers by Products and Services
The top three products and services offering customers that use Postmark for Email Deliverability are Software Development (11), Web Development (10), Saas (9).
Customers
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Postmark Customers by Employee Size
The majority of Postmark's customers for the email-deliverability category fall in the company size of 20 - 49 employees (62 companies), 100 - 249 employees (52 companies), 0 - 9 employees (39 companies).
Employee Size
Postmark Customers by Geography
The top three geographies of Postmark for email-deliverability are the United States with 135(67.84%), United Kingdom with 17(8.54%), Canada with 14(7.04%) customers respectively.
Customers
Employees of Postmark
Also see other Products/Services by Postmark in:
FAQ
Find answers to the most often asked questions by users.
Who are the top Postmark competitors?
Postmark’s Top competitors in the email-deliverability category are Litmus, SquirrelMail, SocketLabs. You can view a full list of Postmark competitors here. 6sense uses advanced data mining and AI algorithms to track customers and competitors of Postmark and 40,000 other technologies on the internet. You can also compare Postmark and its feature with top competitors here : Postmark vs Litmus Postmark vs SquirrelMail Postmark vs SocketLabs.
What is Postmark customer distribution based on company size?
What is Postmark market share in the email-deliverability?
What are the top countries that use Postmark?
What are the top industries that use Postmark?
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