10 buyer questions asked on ChatGPT, Gemini, Perplexity — 30 answers analysed, 2026-09-20. Ranked by how many answers named each product. Postmark was named most often (22 of 30).
| # | Product | Answers naming it | Share of voice | % |
|---|---|---|---|---|
| 1 | Postmark | 22 |
|
73% |
| 2 | Amazon SES | 20 |
|
67% |
| 3 | Resend | 19 |
|
63% |
| 4 | SendGrid scored 54/100 | 18 |
|
60% |
| 5 | Mailgun | 15 |
|
50% |
| 6 | Brevo | 10 |
|
33% |
| 7 | Mailtrap Email Sending | 8 |
|
27% |
| 8 | MailerSend | 6 |
|
20% |
| 9 | SMTP2GO | 3 |
|
10% |
| 10 | Loops | 2 |
|
7% |
| 11 | Mailjet | 1 |
|
3% |
| 12 | SparkPost | 1 |
|
3% |
Which one do the AI assistants actually name more often?
Postmark vs Amazon SESPostmark vs ResendAmazon SES vs ResendWe'll ask the same 10 questions about your product and show you which ones you're missing from. Takes about a minute — no account, no card.
Scanning in transactional email API — the same category as this table.
Method: each surface was asked the same 10 buyer questions; every answer was analysed for which products it named. Counts are mentions in answers, not endorsements. Nobody pays to be listed.