Postmark
Postmark provides transactional email delivery for web apps with minimal setup time and maintenance.
Market Share of Postmark
Current Customer(s)
98
Market Share (Est.)
1.15%
Ranking
#10
Top Competitors and Alternatives of Postmark
The top three of Postmark’s competitors in the Email Deliverability category are SocketLabs with 48.35%, MasterBase with 12.23%, Litmus with 12.02% market share.
| Technology | Domains | Market Share (Est.) | Versus page |
|---|---|---|---|
| SocketLabs | 4110 | 48.35% | Postmark vs SocketLabs |
| MasterBase | 1040 | 12.23% | Postmark vs MasterBase |
| Litmus | 1022 | 12.02% | Postmark vs Litmus |
| SquirrelMail | 899 | 10.58% | Postmark vs SquirrelMail |
| Pepipost | 374 | 4.40% | Postmark vs Pepipost |
| Email On Acid | 193 | 2.27% | Postmark vs Email On Acid |
| WhatCounts | 178 | 2.09% | Postmark vs WhatCounts |
| PowerMTA | 143 | 1.68% | Postmark vs PowerMTA |
| SparkPost | 117 | 1.38% | Postmark vs SparkPost |
| SMTP2GO | 87 | 1.02% | Postmark vs SMTP2GO |
| 250ok | 38 | 0.45% | Postmark vs 250ok |
| Mailtrap | 38 | 0.45% | Postmark vs Mailtrap |
| DataValidation | 32 | 0.38% | Postmark vs DataValidation |
| SMTP.com | 21 | 0.25% | Postmark vs SMTP.com |
| BriteVerify | 20 | 0.24% | Postmark vs BriteVerify |
| CritSend | 18 | 0.21% | Postmark vs CritSend |
| eDataSource | 14 | 0.16% | Postmark vs eDataSource |
| EmailSuccess | 13 | 0.15% | Postmark vs EmailSuccess |
| EmailDelivered | 10 | 0.12% | Postmark vs EmailDelivered |
| InboxFirst | 7 | 0.08% | Postmark vs InboxFirst |
Popular Comparisons
Top Competitors and Alternatives of Postmark
The top three of Postmark’s competitors in the Email Deliverability category are SocketLabs with 48.35%, MasterBase with 12.23%, Litmus with 12.02% market share.
Postmark vs SocketLabs
Postmark vs MasterBase
Postmark vs Litmus
Postmark vs SquirrelMail
Postmark vs Pepipost
Postmark vs Email On Acid
Postmark vs WhatCounts
Postmark vs PowerMTA
Customers of Postmark
Around the world in 2025, over 95 companies have started using Postmark as Email Deliverability tool.
| Customers | Employee Range | City | Region | Country | Social Links |
|---|---|---|---|---|---|
| NetApp | 10,000+ | San Jose | California | United States |     |
| Sage | 10,000+ | Newcastle upon Tyne | England | United Kingdom | |
| UNICEF | 10,000+ | New York City | New York | United States | |
| IKEA | 10,000+ | Malmoe | Skane | Sweden | |
| ATI Physical Therapy | 5,000 - 9,999 | Bolingbrook | Illinois | United States | |
| 1Password | 1,000 - 4,999 | Toronto | Ontario | Canada | |
| Asana | 1,000 - 4,999 | San Francisco | California | United States | |
| ActiveCampaign | 1,000 - 4,999 | Chicago | Illinois | United States | |
| Proposify | 500 - 999 | Halifax | Nova Scotia | Canada | |
| Kreydle Sdn Bhd | 500 - 999 | Petaling Jaya | Selangor | Malaysia | |
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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 (5), Software Development (4), Education (3).
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 0 - 9 employees (27 companies), 20 - 49 employees (24 companies), 100 - 249 employees (17 companies).
Employee Size
Postmark Customers by Geography
The top three geographies of Postmark for email-deliverability are the United States with 52(59.09%), United Kingdom with 12(13.64%), Canada with 8(9.09%) 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 SocketLabs, MasterBase, Litmus. 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 SocketLabs Postmark vs MasterBase Postmark vs Litmus.
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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