Postmark vs Mailchimp Transactional (formerly Mandrill)

Postmark8.6Visit Mailchimp Transactional (formerly Mandrill)8.3Visit

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

vs

Mailchimp Transactional (formerly Mandrill) #3 in Transactional Email Software 8.3/10 From $20 ✓ 2 of 2 features Visit Mailchimp

• Postmark fits best

  Teams prioritizing message-stream separation

• Mailchimp Transactional (formerly Mandrill) fits best

  High-volume transactional sending with predictable blocks

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Side by side

Feature	Postmark 8.6/10 Visit ↗	Mailchimp Transactional (formerly Mandrill) 8.3/10 Visit ↗
At a glance
Editor score	8.6	8.3
Ranking	#2 in Transactional Email Software	#3 in Transactional Email Software
Best for	Teams prioritizing message-stream separation	High-volume transactional sending with predictable blocks
Pricing model	Free plan + paid	Paid
Starting price	$15/mo	Not published
Free plan	✓ (best)	—
Free trial	—	—
Deployment	Cloud	Cloud
Platforms	Web	Web
Support	Live chat, Docs	Docs
Built for	Solo, Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features Postmark 1/2 · Mailchimp Transactional (formerly Mandrill) 2/2
Event webhooks	Not published	✓ (best)
Dedicated IP option	✓	✓
Specs
Delivery methods	Not published	Both
Template options	Not published	Both
Delivery log retention	Not published	30 days
Monthly send limit	10000 emails/mo	25000 emails/mo (best)
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	Supports both transactional API and SMTP sending Includes templates, dynamic content, webhooks, and inbound processing Per-block pricing falls from $20 to $10 at 161+ blocks
Cons	Free plan allows only 100 emails per month Free plan does not allow overages Advanced inbound processing starts with the Pro plan	No permanent free plan Requires a Mailchimp account Email content is retained for 30 days
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 Transactional, formerly Mandrill, is a cloud email delivery service for developers sending personalized, event-driven messages. Its use cases include password resets, order confirmations, welcome emails, and outage alerts.… Read the review →

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 Transactional (formerly Mandrill) — where it wins

  • Supports both transactional API and SMTP sending
  • Includes templates, dynamic content, webhooks, and inbound processing
  • Per-block pricing falls from $20 to $10 at 161+ blocks

  Where it doesn't

  • No permanent free plan
  • Requires a Mailchimp account
  • Email content is retained for 30 days

• Postmark8.6/10 · Free plan · paid from $15/mo

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

  Visit PostmarkFull verdict →
• Mailchimp Transactional (formerly Mandrill)8.3/10 · From $20

  A paid transactional email service with API, SMTP, templates, and volume pricing.

  Visit MailchimpFull verdict →