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Head-to-head · Email APIs

Postmark vs MailerSend

  • Updated Oct 2026
  • Both researched from official sources
  • 8 checks side by side
Higher score Postmark #5 in Email APIs 8.8/10 Free plan Free plan✓ 5 of 5 features Visit Postmark
MailerSend #20 in Email APIs 6.8/10 Free plan · 14-day trial Free planFree trial✓ 5 of 5 features Visit MailerSend

Postmark leads on 1 check, MailerSend on 1, and 6 are even. Who comes out ahead on the 8 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scorePostmark · 8.8/10
  • Lowest starting priceMailerSend · $7/mo
  • Free planboth
  • Free trialonly MailerSend

Postmark scores higher on our rubric for email apis: 8.8 against 6.8 out of 10; our editors rank them #5 and #20.

MailerSend is cheaper to start at $7/mo against $15/mo. Postmark leads on monthly send limit: 10000 /mo versus 5000 /mo.

Postmark is the better fit for transactional email teams prioritizing deliverability. MailerSend is the better fit for small teams needing inexpensive full email delivery.

  • Postmark fits best

    Transactional email teams prioritizing deliverability

  • MailerSend fits best

    Small teams needing inexpensive full email delivery

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Side by side

Feature Postmark 8.8/10 Visit ↗ MailerSend 6.8/10 Visit ↗
At a glance
Editor score 8.8 6.8
Ranking #5 in Email APIs #20 in Email APIs
Best for Transactional email teams prioritizing deliverability Small teams needing inexpensive full email delivery
Pricing model Free plan + paid Free plan + paid
Starting price $15/mo $7/mo (best)
Free plan ✓ ✓
Free trial — 14 days
Deployment Cloud Cloud, Mobile
Platforms Web Web, iOS
Features Postmark 5/5 · MailerSend 5/5
Inbound email ✓ ✓
Delivery event webhooks ✓ ✓
SMTP relay ✓ ✓
Email templates ✓ ✓
Dedicated IP option ✓ ✓
Specs
Monthly send limit 10000 /mo (best) 5000 /mo
Our review
Pros
  • REST API, SMTP sending, and separate transactional and broadcast streams
  • Delivery, bounce, open, click, and spam complaint webhooks
  • Inbound email parsing, templates, analytics, and official libraries
  • Free plan includes API, SMTP relay, webhooks, and inbound routing
  • Hobby starts at $7/month with 5,000 emails and 1,000 API requests daily
  • Templates, tracking, verification, and multiple sending domains support core workflows
Cons
  • Free plan allows only 100 emails per month
  • Basic and Pro plans limit monthly volume to 10,000 emails
  • Broadcast and transactional workflows require stream management
  • Free plan is limited to 500 emails monthly and 100 emails daily
  • Professional lists 50,000 emails monthly, matching the Starter limit
  • Dedicated IP support is reserved for Enterprise accounts over 100,000 weekly emails
Our verdict

Postmark is an email delivery service for application teams sending transactional and broadcast messages through REST APIs or SMTP. It supports individual and batch messages, separate message streams, reusable HTML and plain-text…

Read the review →

MailerSend is a transactional messaging service for developers and teams sending application-generated email. Its core tools cover a transactional email API, SMTP relay, inbound email routing and parsing, delivery-event webhooks, reusable…

Read the review →
  1. PostmarkEmail APIs 8.8Free plan
  2. MailerSendEmail APIs 6.8Free plan · 14-day trial

Strengths and trade-offs

  • Postmark — where it wins

    • REST API, SMTP sending, and separate transactional and broadcast streams
    • Delivery, bounce, open, click, and spam complaint webhooks
    • Inbound email parsing, templates, analytics, and official libraries

    Where it doesn't

    • Free plan allows only 100 emails per month
    • Basic and Pro plans limit monthly volume to 10,000 emails
    • Broadcast and transactional workflows require stream management

  • MailerSend — where it wins

    • Free plan includes API, SMTP relay, webhooks, and inbound routing
    • Hobby starts at $7/month with 5,000 emails and 1,000 API requests daily
    • Templates, tracking, verification, and multiple sending domains support core workflows

    Where it doesn't

    • Free plan is limited to 500 emails monthly and 100 emails daily
    • Professional lists 50,000 emails monthly, matching the Starter limit
    • Dedicated IP support is reserved for Enterprise accounts over 100,000 weekly emails

More comparisons

All email APIs comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update