MailerSend vs Postmark:Which is more popular?
In September 2026, Postmark had more branded searches than MailerSend among email API platforms worldwide. Postmark had about 77,300 branded searches, while MailerSend had 9,900. Postmark made up 13.4% of all email API platform searches we track, and MailerSend accounted for 1.7%. When we asked ChatGPT and Google AI Overviews about email API platforms, Postmark appeared in all five answers and MailerSend in none.
Who do people search for more?
Postmark, about 8 searches for every 1 for MailerSend
Who does AI mention more?
Postmark, mentioned in every answer we collected
Who does AI recommend more?
Postmark, the only one of the two named
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Top email API platforms in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Postmark appeared in all five answers. MailerSend did not appear in any of the five answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
- Postmark1st
Resend2nd
Amazon SES3rd
Mailgun4th
Twilio SendGrid5th
Mailtrap6th
Mailjet–
MailerSend–
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Postmark5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Mailgun4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Resend4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Amazon SES4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Twilio SendGrid3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Mailtrap1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Mailjet0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- MailerSend0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about email API platforms
5 answers
Asked ChatGPT
“Which email API platform should I use?”
Asked ChatGPT
“What are the best email API platforms?”
Asked ChatGPT
“What's the best email API platform for transactional email?”
Searched Google, AI Overview
“best email api”
Searched Google, AI Overview
“transactional email api”
Not named in any answer:
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is MailerSend or Postmark more popular in search?
This chart shows how often people search Google for MailerSend and Postmark by name. Each line represents a brand's share of searches for all eight email API platforms we track, month by month, from English-language searches worldwide.
Share of searches by month for Postmark, MailerSend. The figures are in the table below the chart.
View monthly share of searches table
| Month | Twilio SendGrid | Postmark | Mailgun | Mailjet | Resend | Mailtrap | Amazon SES | MailerSend |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 43.2% | 8.8% | 15.3% | 15.3% | 2.4% | 8.4% | 4.6% | 2.1% |
| Nov 2025 | 40.1% | 10% | 17.4% | 14.3% | 2.9% | 7.8% | 5.2% | 2.3% |
| Dec 2025 | 41.6% | 12.5% | 14.8% | 12.1% | 3.4% | 8.1% | 5.4% | 2% |
| Jan 2026 | 38.2% | 11.7% | 16.6% | 13.6% | 4.2% | 7.5% | 6.1% | 2.2% |
| Feb 2026 | 39.1% | 11.9% | 17% | 11.4% | 4.8% | 7.7% | 6.2% | 1.9% |
| Mar 2026 | 41.7% | 10.4% | 14.8% | 12.1% | 5.8% | 8.1% | 5.4% | 1.6% |
| Apr 2026 | 38% | 11.5% | 16.4% | 11% | 6.4% | 9% | 6% | 1.8% |
| May 2026 | 41.1% | 12.4% | 14.7% | 9.8% | 7% | 8% | 5.4% | 1.6% |
| Jun 2026 | 40.2% | 12.1% | 14.3% | 11.7% | 7% | 7.9% | 5.2% | 1.6% |
| Jul 2026 | 35.2% | 12.9% | 15.3% | 10.2% | 9.6% | 8.4% | 6.8% | 1.7% |
| Aug 2026 | 37.9% | 14% | 13.4% | 9% | 9.2% | 7.4% | 7.3% | 1.8% |
| Sep 2026 | 36.3% | 13.4% | 12.9% | 12.8% | 8.8% | 7.1% | 7% | 1.7% |
How has the MailerSend and Postmark comparison changed over the last 12 months?
3 findings
- Postmark was ahead of MailerSend in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, MailerSend’s share of searches among email API platforms worldwide moved from 2.1% to 1.7%, and its estimated monthly branded searches moved from 14.8K to 9.9K.
- Across the 12 months ending September 2026, Postmark’s share of searches among email API platforms worldwide moved from 8.8% to 13.4%, and its estimated monthly branded searches moved from 63.5K to 77.3K.
How did search popularity change for email API platforms worldwide in September 2026?
2 changes
In September 2026, Postmark lost share of searches among email API platforms worldwide, from 14% to 13.4%.
Estimated monthly branded searches for MailerSend worldwide fell 33.1% over 12 measured months, from 14.8K to 9.9K in September 2026.
How are branded searches counted?
4 search terms
Brandwave collects information about searches that people make online using MailerSend’s and Postmark’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
MailerSend
1 branded search term
- mailersend
Postmark
3 branded search terms
- postmark
- postmark email
- postmarkapp
Other head-to-heads among email API platforms
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