Mailchimp Transactional (formerly Mandrill) vs Plunk

Mailchimp Transactional (formerly Mandrill)8.3Visit Plunk6.9Visit

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

vs

Plunk #6 in Transactional Email Software 6.9/10 Free plan · paid from $0.00 Free plan✓ 0 of 2 features Visit Plunk

• Mailchimp Transactional (formerly Mandrill) fits best

  High-volume transactional sending with predictable blocks

• Plunk fits best

  Flexible self-hosted or pay-as-you-go sending

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Side by side

Feature	Mailchimp Transactional (formerly Mandrill) 8.3/10 Visit ↗	Plunk 6.9/10 Visit ↗
At a glance
Editor score	8.3	6.9
Ranking	#3 in Transactional Email Software	#6 in Transactional Email Software
Best for	High-volume transactional sending with predictable blocks	Flexible self-hosted or pay-as-you-go sending
Pricing model	Paid	Free plan + paid
Starting price	Not published	Not published
Free plan	—	✓ (best)
Free trial	—	—
Deployment	Cloud	Cloud, Self-hosted
Platforms	Web	Web
Support	Docs	Email, Community, Docs
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market
Features Mailchimp Transactional (formerly Mandrill) 2/2 · Plunk 0/2
Event webhooks	✓ (best)	Not published
Dedicated IP option	✓ (best)	Not published
Specs
Delivery methods	Both	Not published
Template options	Both	Not published
Delivery log retention	30 days	Not published
Monthly send limit	25000 emails/mo	Not published
Our review
Pros	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	Free plan includes 1,000 monthly emails and unlimited contacts Pay-as-you-grow pricing is $0.001 per email with unlimited sending REST API, SMTP relay, inbound processing, workflows, and Docker self-hosting
Cons	No permanent free plan Requires a Mailchimp account Email content is retained for 30 days	The Free plan is limited to 1,000 emails per month Usage-based billing can make monthly costs vary with send volume Self-hosting with Docker Compose requires technical administration
Our verdict	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 →	Plunk is an open-source email platform for developers and teams managing transactional email, campaigns, workflows, contacts, and analytics. It supports REST API delivery, SMTP relay, inbound email processing, reusable templates, dynamic… Read the review →

Strengths and trade-offs

• 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

• Plunk — where it wins

  • Free plan includes 1,000 monthly emails and unlimited contacts
  • Pay-as-you-grow pricing is $0.001 per email with unlimited sending
  • REST API, SMTP relay, inbound processing, workflows, and Docker self-hosting

  Where it doesn't

  • The Free plan is limited to 1,000 emails per month
  • Usage-based billing can make monthly costs vary with send volume
  • Self-hosting with Docker Compose requires technical administration

• Mailchimp Transactional (formerly Mandrill)8.3/10 · From $20

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

  Visit MailchimpFull verdict →
• Plunk6.9/10 · Free plan · paid from $0.00

  A flexible email platform combining API delivery, automation, analytics, and self-hosting.

  Visit PlunkFull verdict →