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Head-to-head · Transactional Email Software

Postmark vs Mailchimp

  • Updated Sep 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Postmark #2 in Transactional Email Software 8.6/10 Free plan · paid from $15/mo Free plan✓ 1 of 2 features Visit Postmark
Mailchimp #34 in Transactional Email Software 4.9/10 Free plan · 14-day trial Free plan✓ 0 of 2 features Visit Mailchimp

Postmark leads on 2 checks, Mailchimp on 0, and 1 is even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scorePostmark · 8.6/10
  • Free planboth
  • Most featuresPostmark · 1 of 2

Postmark scores higher on our rubric for transactional email software: 8.6 against 4.9 out of 10; our editors rank them #2 and #34.

Postmark offers dedicated ip option; Mailchimp doesn't publish it. Postmark leads on monthly send limit: 10000 emails/mo versus 5000 emails/mo.

Postmark is the better fit for teams prioritizing message-stream separation. Mailchimp is the better fit for small businesses needing email marketing breadth.

  • Postmark fits best

    Teams prioritizing message-stream separation

  • Mailchimp fits best

    Small businesses needing email marketing breadth

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. It never changes our verdict. How we rank.

Side by side

Feature Postmark 8.6/10 Visit ↗ Mailchimp 4.9/10 Visit ↗
At a glance
Editor score 8.6 4.9
Ranking #2 in Transactional Email Software #34 in Transactional Email Software
Best for Teams prioritizing message-stream separation Small businesses needing email marketing breadth
Pricing model Free plan + paid Free plan + paid
Starting price $15/mo Not published
Free plan ✓ ✓
Free trial — —
Deployment Cloud Cloud, Mobile
Platforms Web Web, iOS, Android
Support Live chat, Docs Email, Live chat, Phone, Docs · 24/7
Compliance GDPR, 2FA GDPR
Integrations 12 integrations 300+ integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Postmark 1/2 · Mailchimp 0/2
Event webhooks Not published Not published
Dedicated IP option ✓ (best) Not published
Specs
Delivery methods Not published Not published
Template options Not published Not published
Delivery log retention Not published Not published
Monthly send limit 10000 emails/mo (best) 5000 emails/mo
Our review
Pros
  • Separate transactional and broadcast message streams
  • REST API, SMTP sending, inbound parsing, and event webhooks
  • Reusable templates with previews, variables, and test sends
  • Free plan includes A/B testing, landing pages, and forms
  • Advanced tiers add segmentation, automation flows, and multivariate testing
  • Web, mobile, API, and many business-tool integrations support varied workflows
Cons
  • Free plan allows only 100 emails per month
  • Free plan does not allow overages
  • Advanced inbound processing starts with the Pro plan
  • The product emphasizes marketing rather than transactional email delivery
  • Paid pricing varies by contact tier, making plan comparison less direct
  • The Free plan is limited to 250 contacts and 500 monthly sends
Our verdict

Postmark is an email delivery service for application teams sending transactional and broadcast messages through REST APIs or SMTP. It supports web and API access, official libraries for multiple programming languages and frameworks,…

Read the review →

Mailchimp is an email marketing and marketing automation platform for growing businesses. It supports campaign creation, audience management, segmentation, automated email flows, landing pages, analytics, testing, signup forms, and mobile…

Read the review →
  1. PostmarkTransactional Email Software 8.6Free plan · paid from $15/mo
  2. MailchimpTransactional Email Software 4.9Free plan · 14-day trial

Strengths and trade-offs

  • Postmark — where it wins

    • Separate transactional and broadcast message streams
    • REST API, SMTP sending, inbound parsing, and event webhooks
    • Reusable templates with previews, variables, and test sends

    Where it doesn't

    • Free plan allows only 100 emails per month
    • Free plan does not allow overages
    • Advanced inbound processing starts with the Pro plan

  • Mailchimp — where it wins

    • Free plan includes A/B testing, landing pages, and forms
    • Advanced tiers add segmentation, automation flows, and multivariate testing
    • Web, mobile, API, and many business-tool integrations support varied workflows

    Where it doesn't

    • The product emphasizes marketing rather than transactional email delivery
    • Paid pricing varies by contact tier, making plan comparison less direct
    • The Free plan is limited to 250 contacts and 500 monthly sends
  • Postmark8.6/10 · Free plan · paid from $15/mo

    A focused email delivery service for teams separating transactional and broadcast traffic.

    Visit PostmarkFull verdict →
  • Mailchimp4.9/10 · Free plan · 14-day trial

    A broad marketing platform with automation, analytics, and integrations beyond transactional email.

    Visit MailchimpFull verdict →

More comparisons

All transactional email software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated · How we research and update