Postmark
Postmark provides transactional email delivery for web apps with minimal setup time and maintenance.
Market Share of Postmark
Current Customer(s)
135
Market Share (Est.)
2.59%
Ranking
#10
Top Competitors and Alternatives of Postmark
The top three of Postmark’s competitors in the Email Deliverability category are Litmus with 28.74%, SquirrelMail with 18.11%, SocketLabs with 14.25% market share.
| Technology | Domains | Market Share (Est.) | Versus page |
|---|---|---|---|
| Litmus | 1496 | 28.74% | Postmark vs Litmus |
| SquirrelMail | 943 | 18.11% | Postmark vs SquirrelMail |
| SocketLabs | 742 | 14.25% | Postmark vs SocketLabs |
| Email On Acid | 292 | 5.61% | Postmark vs Email On Acid |
| SparkPost | 237 | 4.55% | Postmark vs SparkPost |
| MasterBase | 203 | 3.90% | Postmark vs MasterBase |
| PowerMTA | 197 | 3.78% | Postmark vs PowerMTA |
| WhatCounts | 175 | 3.36% | Postmark vs WhatCounts |
| Pepipost | 150 | 2.88% | Postmark vs Pepipost |
| SMTP2GO | 130 | 2.50% | Postmark vs SMTP2GO |
| Mailtrap | 97 | 1.86% | Postmark vs Mailtrap |
| Netcore Email API | 96 | 1.84% | Postmark vs Netcore Email API |
| 250ok | 66 | 1.27% | Postmark vs 250ok |
| SMTP.com | 43 | 0.83% | Postmark vs SMTP.com |
| BriteVerify | 37 | 0.71% | Postmark vs BriteVerify |
| DataValidation | 34 | 0.65% | Postmark vs DataValidation |
| CritSend | 24 | 0.46% | Postmark vs CritSend |
| turboSMTP | 22 | 0.42% | Postmark vs turboSMTP |
| EmailDelivered | 18 | 0.35% | Postmark vs EmailDelivered |
| eDataSource | 16 | 0.31% | Postmark vs eDataSource |
Popular Comparisons
Top Competitors and Alternatives of Postmark
The top three of Postmark’s competitors in the Email Deliverability category are Litmus with 28.74%, SquirrelMail with 18.11%, SocketLabs with 14.25% market share.
Postmark vs Litmus
Postmark vs SquirrelMail
Postmark vs SocketLabs
Postmark vs Email On Acid
Postmark vs SparkPost
Postmark vs MasterBase
Postmark vs PowerMTA
Postmark vs WhatCounts
Customers of Postmark
Around the world in 2026, over 135 companies have started using Postmark as Email Deliverability tool.
| Customers | Employee Range | City | Region | Country | Social Links |
|---|---|---|---|---|---|
| Baxter International Inc. | 10,000+ | Deerfield | Illinois | United States |     |
| UNICEF | 10,000+ | New York City | New York | United States | |
| Cimpress | 10,000+ | Waltham | Massachusetts | United States | |
| DronaHQ | 10,000+ | Mumbai | Maharashtra | India | |
| Farmers Insurance | 10,000+ | Woodland Hills | California | United States | |
| Livestream | 10,000+ | Brooklyn | New York | United States | |
| Sage | 10,000+ | Newcastle upon Tyne | England | United Kingdom | |
| Bayer AG | 10,000+ | Leverkusen | North Rhine-Westphalia | Germany | |
| IKEA | 10,000+ | Delft | South Holland | Netherlands | |
| 1Password | 1,000 - 4,999 | Toronto | Ontario | Canada | |
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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 Saas (6), Software Development (6), Technology (6).
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 (34 companies), 0 - 9 employees (31 companies), 100 - 249 employees (23 companies).
Employee Size
Postmark Customers by Geography
The top three geographies of Postmark for email-deliverability are the United States with 84(68.29%), United Kingdom with 12(9.76%), Canada with 8(6.50%) customers respectively.
Customers
Employees of Postmark
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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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