Resend vs SMTP2GO:Which is more popular?
In September 2026, Resend had more branded searches than SMTP2GO among transactional email services worldwide. Resend had about 50,900 branded searches, while SMTP2GO had 40,500. Resend made up 8.4% of all transactional email service searches we track, and SMTP2GO accounted for 6.7%. When we asked ChatGPT and Google AI Overviews about transactional email services, Resend appeared in four of the five answers and SMTP2GO in two. Resend was mentioned before SMTP2GO in three out of five answers.
Who do people search for more?
Resend, about 26% more searches than SMTP2GO
Who does AI mention more?
Resend, mentioned in 4 of 5 answers, SMTP2GO in 2
Who does AI recommend more?
Resend, named ahead of SMTP2GO in 3 of 5 answers
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Top transactional email services in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Resend was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. SMTP2GO was mentioned in two out of five: not in any of the three ChatGPT answers, but in both Google AI Overviews. Resend was listed before SMTP2GO in three out of five answers.
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.
Is Resend or SMTP2GO more popular in search?
This chart shows how often people search Google for Resend and SMTP2GO 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 Resend, 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% |
How has the Resend and SMTP2GO comparison changed over the last 12 months?
3 findings
- The lead changed hands once in the 12 months ending September 2026: Resend took it in April 2026.
- Across the 12 months ending September 2026, Resend’s share of searches among transactional email services worldwide moved from 2.3% to 8.4%, and its estimated monthly branded searches moved from 17K to 50.9K.
- Across the 12 months ending September 2026, SMTP2GO’s share of searches among transactional email services worldwide moved from 5.4% to 6.7%, and its estimated monthly branded searches held steady at 40.5K.
How did search popularity change for transactional email services worldwide in September 2026?
2 changes
In September 2026, Mailjet overtook Resend to rank 4th among transactional email services worldwide, with 12.2% of the searches.
Estimated monthly branded searches for Resend worldwide rose 200.4% over 12 measured months, from 17K to 50.9K in September 2026.
How are branded searches counted?
5 search terms
Brandwave collects information about searches that people make online using Resend’s and SMTP2GO’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.
Other head-to-heads among transactional email services
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