MailerSend vs Postal

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

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MailerSend edges out Postal overall, with an overall score of 10 versus 7 and a presence in 10 of 62 answers compared to Postal's 5. Claude rates MailerSend highest at 21, while Postal tops out at 11 with the same assistant. MailerSend shows up most for cost and startup-focused questions, like "cheapest way to send transactional email at scale" (2 of 3 answers), while Postal owns the self-hosted niche, named in all 3 answers for "best open-source or self-hosted transactional email server." Head-to-head, MailerSend was named more often in 7 questions, Postal in just 1, with 12 ties between them.

Head to head

metric	MailerSend	Postal
score	10	7
questions won	8	3

By assistant

MailerSend

assistant	score	named in, this week	usual spot, this week
ChatGPT	0	0% of answers
Claude	21	35% of answers	#5.7
Gemini	not sampled this week
Perplexity	11	15% of answers	#3.7

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 MailerSend gets named for

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

Only Postal gets named for

What's the best open-source or self-hosted transactional email server?

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