Transactional email services:Which are most popular?
In September 2026, Twilio SendGrid was the most searched transactional email service worldwide, accounting for 34.4% of all searches among the eight services we track. When we checked with ChatGPT and Google AI Overviews, Postmark and Amazon SES showed up in every answer. Postmark was recommended most often, coming first in one out of five responses.
Twilio SendGridShare of searches 34.4%Mentioned in 3 of 5 AI answersPlace in AI recommendations 4th
PostmarkShare of searches 12.7%Mentioned in 5 of 5 AI answersPlace in AI recommendations 1st
MailgunShare of searches 12.2%Mentioned in 4 of 5 AI answersPlace in AI recommendations 5th
MailjetShare of searches 12.2%Mentioned in 0 of 5 AI answersPlace in AI recommendations –
ResendShare of searches 8.4%Mentioned in 4 of 5 AI answersPlace in AI recommendations 2nd
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Top transactional email services in ChatGPT and Google AI Overviews
In Brandwave's three ChatGPT questions and two Google AI Overviews, Postmark and Amazon SES appeared every time. Postmark was recommended most often, coming first in one out of five answers. Resend was second, and Amazon SES was third. Mailjet, which ranked fourth in searches, was not mentioned at all.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
- Postmark1st
- Resend2nd
Amazon SES3rd- Twilio SendGrid4th
- Mailgun5th
- SMTP2GO6th
- Mailjet–
Mailtrap–
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
- Amazon SES5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Mailgun4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Resend4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Twilio SendGrid3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- SMTP2GO2 of 5Named in 0 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Mailjet0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Mailtrap0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about transactional email services
5 answers
Asked ChatGPT
“Which transactional email service should I use?”
Asked ChatGPT
“What are the best transactional email services?”
Asked ChatGPT
“What's the best transactional email service for app notifications?”
Searched Google, AI Overview
“transactional email service”
Searched Google, AI Overview
“email delivery service”
Brands are shown in the order each answer named them. The survey took place in the United States on October 21, 2026.
Which transactional email services do people search for most?
This chart shows how often people search Google for each transactional email service by name. Each line represents a brand's share of searches for all eight transactional email services we track, month by month, from English-language searches worldwide.
Share of searches by month for Twilio SendGrid, Postmark, Mailgun, Mailjet, Resend, Mailtrap, Amazon SES, SMTP2GO. 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 | SMTP2GO |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 41.7% | 8.5% | 14.8% | 14.8% | 2.3% | 8.1% | 4.4% | 5.4% |
| Nov 2025 | 38.5% | 9.6% | 16.7% | 13.7% | 2.8% | 7.5% | 5% | 6.1% |
| Dec 2025 | 39.7% | 12% | 14.2% | 11.6% | 3.3% | 7.8% | 5.2% | 6.3% |
| Jan 2026 | 36.3% | 11.1% | 15.8% | 12.9% | 4% | 7.1% | 5.8% | 7.1% |
| Feb 2026 | 37.5% | 11.4% | 16.3% | 10.9% | 4.6% | 7.3% | 6% | 6% |
| Mar 2026 | 39.7% | 9.9% | 14.1% | 11.6% | 5.5% | 7.8% | 5.2% | 6.3% |
| Apr 2026 | 36.4% | 11% | 15.7% | 10.5% | 6.1% | 8.7% | 5.8% | 5.8% |
| May 2026 | 39.2% | 11.8% | 14% | 9.3% | 6.7% | 7.7% | 5.1% | 6.2% |
| Jun 2026 | 38.3% | 11.6% | 13.7% | 11.2% | 6.7% | 7.5% | 5% | 6.1% |
| Jul 2026 | 33.5% | 12.3% | 14.5% | 9.7% | 9.1% | 8% | 6.5% | 6.5% |
| Aug 2026 | 35.9% | 13.3% | 12.7% | 8.5% | 8.7% | 7% | 6.9% | 6.9% |
| Sep 2026 | 34.4% | 12.7% | 12.2% | 12.2% | 8.4% | 6.7% | 6.7% | 6.7% |
| Rank | Brand | Share of searches | Estimated monthly branded searches | vs prior month | Share change |
|---|---|---|---|---|---|
| 1, held 1st | 34.4% | 209K | 0% | -1.4 points | |
| 2, held 2nd | 12.7% | 77.3K | 0% | -0.5 points | |
| 3, held 3rd | 12.2% | 74.1K | -0.04% | -0.5 points | |
| 4, moved from 5th to 4th | 12.2% | 74K | +49.5% | +3.7 pointsmoved from 5th to 4th | |
| 5, moved from 4th to 5th | 8.4% | 50.9K | +0.06% | -0.3 pointsmoved from 4th to 5th | |
| 6, held 6th | 6.7% | 40.8K | -0.1% | -0.3 points | |
| 7, held 7th | 6.7% | 40.5K | 0% | -0.3 points | |
| 8, held 8th | 6.7% | 40.5K | 0% | -0.3 points |
34.4%
Held 1st. 209K estimated branded searches, 0% vs prior month. Share -1.4 points.
2.
Postmark12.7%
Held 2nd. 77.3K estimated branded searches, 0% vs prior month. Share -0.5 points.
3.
Mailgun12.2%
Held 3rd. 74.1K estimated branded searches, -0.04% vs prior month. Share -0.5 points.
4.
Mailjet12.2%
Moved from 5th to 4th. 74K estimated branded searches, +49.5% vs prior month. Share +3.7 points.
5.
Resend8.4%
Moved from 4th to 5th. 50.9K estimated branded searches, +0.06% vs prior month. Share -0.3 points.
6.
Mailtrap6.7%
Held 6th. 40.8K estimated branded searches, -0.1% vs prior month. Share -0.3 points.
6.7%
Held 7th. 40.5K estimated branded searches, 0% vs prior month. Share -0.3 points.
8.SMTP2GO
6.7%
Held 8th. 40.5K estimated branded searches, 0% vs prior month. Share -0.3 points.
Which brand is most popular in search among transactional email services worldwide?
8 brands
In September 2026, Twilio SendGrid was the most searched among transactional email services worldwide, with an estimated 209K branded searches, 34.4% of all searches for the eight we track. Postmark is in 2nd place, 21.7 percentage points behind at 12.7%.
| Brand | Share of searches | Peak | Low | Rank |
|---|---|---|---|---|
| Twilio SendGrid | 41.7% → 34.4% | 41.7%Oct 2025 | 33.5%Jul 2026 | 1st |
| Postmark | 8.5% → 12.7% | 13.3%Aug 2026 | 8.5%Oct 2025 | 4th → 2nd |
| Mailgun | 14.8% → 12.2% | 16.7%Nov 2025 | 12.2%Sep 2026 | 2nd → 3rd |
| Mailjet | 14.8% → 12.2% | 14.8%Oct 2025 | 8.5%Aug 2026 | 3rd → 4th |
| Resend | 2.3% → 8.4% | 9.1%Jul 2026 | 2.3%Oct 2025 | 8th → 5th |
| Mailtrap | 8.1% → 6.7% | 8.7%Apr 2026 | 6.7%Sep 2026 | 5th → 6th |
| Amazon SES | 4.4% → 6.7% | 6.9%Aug 2026 | 4.4%Oct 2025 | 7th |
| SMTP2GO | 5.4% → 6.7% | 7.1%Jan 2026 | 5.4%Oct 2025 | 6th → 8th |
Each finding as a sentence
- Across the 12 months ending September 2026, Twilio SendGrid’s share of searches among transactional email services worldwide decreased from 41.7% to 34.4%.
- Across the 12 months ending September 2026, Postmark’s share of searches among transactional email services worldwide increased from 8.5% to 12.7%.
- Across the 12 months ending September 2026, Mailgun’s share of searches among transactional email services worldwide decreased from 14.8% to 12.2%.
- Across the 12 months ending September 2026, Mailjet’s share of searches among transactional email services worldwide decreased from 14.8% to 12.2%.
- Across the 12 months ending September 2026, Resend’s share of searches among transactional email services worldwide increased from 2.3% to 8.4%.
- Across the 12 months ending September 2026, Mailtrap’s share of searches among transactional email services worldwide decreased from 8.1% to 6.7%.
- Across the 12 months ending September 2026, Amazon SES’s share of searches among transactional email services worldwide increased from 4.4% to 6.7%.
- Across the 12 months ending September 2026, SMTP2GO’s share of searches among transactional email services worldwide increased from 5.4% to 6.7%.
- Across the 12 months ending September 2026, Twilio SendGrid’s share of searches among transactional email services worldwide peaked at 41.7% in October 2025 and was lowest at 33.5% in July 2026.
- Across the 12 months ending September 2026, Postmark’s share of searches among transactional email services worldwide peaked at 13.3% in August 2026 and was lowest at 8.5% in October 2025.
- Across the 12 months ending September 2026, Mailgun’s share of searches among transactional email services worldwide peaked at 16.7% in November 2025 and was lowest at 12.2% in September 2026.
- Across the 12 months ending September 2026, Mailjet’s share of searches among transactional email services worldwide peaked at 14.8% in October 2025 and was lowest at 8.5% in August 2026.
- Across the 12 months ending September 2026, Resend’s share of searches among transactional email services worldwide peaked at 9.1% in July 2026 and was lowest at 2.3% in October 2025.
- Across the 12 months ending September 2026, Mailtrap’s share of searches among transactional email services worldwide peaked at 8.7% in April 2026 and was lowest at 6.7% in September 2026.
- Across the 12 months ending September 2026, Amazon SES’s share of searches among transactional email services worldwide peaked at 6.9% in August 2026 and was lowest at 4.4% in October 2025.
- Across the 12 months ending September 2026, SMTP2GO’s share of searches among transactional email services worldwide peaked at 7.1% in January 2026 and was lowest at 5.4% in October 2025.
- Across the 12 months ending September 2026, Postmark rose from 4th to 2nd among transactional email services worldwide.
- Across the 12 months ending September 2026, Mailgun fell from 2nd to 3rd among transactional email services worldwide.
- Across the 12 months ending September 2026, Mailjet fell from 3rd to 4th among transactional email services worldwide.
- Across the 12 months ending September 2026, Resend rose from 8th to 5th among transactional email services worldwide.
- Across the 12 months ending September 2026, Mailtrap fell from 5th to 6th among transactional email services worldwide.
- Across the 12 months ending September 2026, SMTP2GO fell from 6th to 8th among transactional email services worldwide.
How did search popularity change for transactional email services worldwide in September 2026?
7 changes
In September 2026, Mailjet overtook Resend to rank 4th among transactional email services worldwide, with 12.2% of the searches.
In September 2026, Twilio SendGrid lost share of searches among transactional email services worldwide, from 35.9% to 34.4%.
In September 2026, Postmark lost share of searches among transactional email services worldwide, from 13.3% to 12.7%.
In September 2026, Mailgun lost share of searches among transactional email services worldwide, from 12.7% to 12.2%.
Estimated monthly branded searches for Resend worldwide rose 200.4% over 12 measured months, from 17K to 50.9K in September 2026.
Estimated monthly branded searches for Amazon SES worldwide rose 22.4% over 12 measured months, from 33.1K to 40.5K in September 2026.
Estimated monthly branded searches for Mailtrap worldwide fell 32.7% over 12 measured months, from 60.6K to 40.8K in September 2026.
Compare popularity between leading brands
- Twilio SendGrid vs Postmark: compare popularity
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