Mailtrap vs Postal

as AI assistants see them, week of 2026-09-28

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Mailtrap edges out Postal overall, with an overall score of 13 versus 7 and a presence in 11 of 62 answers compared to Postal's 5. Mailtrap owns the email-testing question, named in 3 of 3 answers, and shows up for free-tier questions too. Postal's moment is self-hosting: it's named in all 3 answers about the best open-source or self-hosted transactional email server, a question where Mailtrap never appears. Head-to-head, Mailtrap leads on 8 questions, Postal on 3, and they tie on 9. By assistant, Claude favors Postal (11 vs 3), while Perplexity favors Mailtrap (28 vs 5).

Head to head

metric	Mailtrap	Postal
score	13	7
questions won	8	3

By assistant

Mailtrap

assistant	score	named in, this week	usual spot, this week
ChatGPT	7	10% of answers	#4.0
Claude	3	5% of answers	#5.0
Gemini	not sampled this week
Perplexity	28	40% of answers	#4.0

Postal

assistant	score	named in, this week	usual spot, this week
ChatGPT	5	5% of answers	#1.0
Claude	11	15% of answers	#3.7
Gemini	not sampled this week
Perplexity	5	5% of answers	#1.0

Where they differ

Only Mailtrap gets named for

What's the best tool to test and preview emails before sending?
Which email API has the best free tier?
Which email API has the best deliverability?
What's the best email service for sending receipts and order confirmations?
What's the best SMTP service for an app?
What's the best email API with webhooks for bounces and opens?
Which transactional email provider has the best developer experience?
What are the best transactional email APIs?

Only Postal gets named for

What's the best open-source or self-hosted transactional email server?
What's the cheapest way to send transactional email at scale?
What's the best transactional email provider for high volume at low cost?

More comparisons

Not sold on either?

Scores count how often each assistant names a product, weighted by position. How the score works · Full Transactional email APIs leaderboard