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Transactional email APIs

Where the assistants get their answers about transactional email apis

The pages ChatGPT and Perplexity read before recommending a product, and who those pages name. Get on these lists, and you get into the answers.

From 40 ChatGPT and Perplexity answers, week of 2026-09-28, the two assistants that cite sources.

Most cited sites

siteanswerspagesnames most
sequenzy.com169SendGrid, Postmark, Amazon SES
brevo.com116Amazon SES, Brevo, SendGrid
emailvendorselection.com105Amazon SES, Postmark, Brevo
mailtrap.io910Mailtrap, Postmark, Amazon SES
postmarkapp.com910Resend, Postmark, Amazon SES
resend.com96Resend, Amazon SES, Postmark
courier.com93Postmark, Amazon SES, Resend
twilio.com83Postmark, Amazon SES, SendGrid
sendlayer.com82Amazon SES, Postmark, SendGrid
smtp.com65Amazon SES, Postmark, SendGrid
apiscout.dev64Resend, Postmark, SendGrid
elasticemail.com62SendGrid, Amazon SES, Resend
lettr.com51Resend, Amazon SES, Mailgun
github.com46Postmark, Postal, Mailgun
mailgun.com44Amazon SES, Mailgun, SendGrid
dupple.com41Amazon SES, Resend, Postmark
infobip.com41Mailgun, Resend, Postmark
nylas.com41Amazon SES, Postmark, SendGrid
prospeo.io41Postmark, Amazon SES, SendGrid
smtp2go.com41Postmark, Amazon SES, SendGrid

Most cited pages

pageanswerscited most fornames
courier.com/best-email-api-providers-for-developers6Which email API has the best deliverability?Mailgun, Postmark, Amazon SES
resend.com6What's the best SMTP service for an app?Resend, Amazon SES, Postmark
sendlayer.com/best-email-api-providers6Which email API has the best deliverability?Amazon SES, Postmark, SendGrid
sequenzy.com/best-api-first-email-platforms6What's the best email API for developers?Postmark, Amazon SES, SendGrid
twilio.com/best-email-api6Which email API has the best deliverability?Postmark, Amazon SES, SendGrid
apiscout.dev/best-email-apis-for-developers-20265What's the best email API for a Next.js or serverless app?Resend, Postmark, SendGrid
brevo.com/best-email-api5What's the best email API for a Next.js or serverless app?Resend, Amazon SES, Brevo
elasticemail.com/9-best-email-api-services-for-growing-businesses-in-20255What's the cheapest way to send transactional email at scale?SendGrid, Amazon SES, Resend
lettr.com/best-transactional-email-services5What are the best transactional email APIs?Resend, Amazon SES, Mailgun
resend.com/pricing5What's the best email API for developers?Resend, Amazon SES, Postmark
dupple.com/best-transactional-email-services4What's the cheapest way to send transactional email at scale?Amazon SES, Resend, Postmark
emailvendorselection.com/best-email-api4What's the best email API for developers?Resend, Amazon SES, Brevo
infobip.com/best-email-api4What's the best email API for developers?Mailgun, Resend, Postmark
nylas.com/best-email-apis4Which email API has the best deliverability?Amazon SES, Postmark, SendGrid
prospeo.io/best-email-apis4Which email API has the best deliverability?Postmark, Amazon SES, SendGrid
smtp2go.com/best-transactional-email-services4What's the best transactional email provider for high volume at low cost?Postmark, Amazon SES, SendGrid
emailable.com/top-email-api3What's the best email API for a Next.js or serverless app?Resend, Postmark, Amazon SES
emailvendorselection.com/transactional-email-services3What's the best transactional email provider for high volume at low cost?Amazon SES, Postmark, Elastic Email
postmarkapp.com3What's the best SMTP service for an app?Resend, Postmark, Amazon SES
sender.net/transactional-email-services3What's the cheapest way to send transactional email at scale?Amazon SES, Postmark, MailerSend
sequenzy.com/best-transactional-email-services3What's the best transactional email provider for high volume at low cost?Amazon SES, SendGrid, Postmark
spotler.com/best-email-sending-api-20263What's the best email API for a Next.js or serverless app?Resend, Postmark, Amazon SES
ventureharbour.com/transactional-email-service-best-mandrill-vs-sendgrid-vs-mailjet3What's the best transactional email provider for high volume at low cost?Amazon SES, Postmark, SendGrid
ahasend.com/best-european-email-apis-20262What's the best email API for a European company that needs EU data hosting?Brevo, Mailgun, Mailjet
albato.com/best-transactional-email-solutions-20242What's the cheapest way to send transactional email at scale?Postmark, Amazon SES, MailerSend

Claude and Gemini answer without citing pages, so they are not counted here. How the score works · Full Transactional email APIs leaderboard