Mailjet vs Postal

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

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Mailjet edges out Postal overall, scoring 9 versus 7 out of 100 and showing up in 8 of 62 answers compared with Postal's 5. Mailjet's strongest showing is on EU data hosting questions, named in 3 of 3 answers, and it also appears for free-tier and startup picks. Postal, meanwhile, owns the self-hosted space, named in all 3 answers about open-source or self-hosted transactional email servers. Head-to-head, Mailjet comes out ahead on 5 questions, Postal on 3, with 12 ties. Neither gets a mention for deliverability or webhook-related questions.

Head to head

metric	Mailjet	Postal
score	9	7
questions won	5	3

By assistant

Mailjet

assistant	score	named in, this week	usual spot, this week
ChatGPT	7	10% of answers	#3.5
Claude	12	20% of answers	#5.8
Gemini	not sampled this week
Perplexity	7	10% of answers	#3.5

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 Mailjet gets named for

What's the best email API for a European company that needs EU data hosting?
Which email API has the best free tier?
Which transactional email service is best for a startup?
What's the best alternative to SendGrid?
What's the best email API in 2026?

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