Enterprise deliverability meets developer control

Mailgun vs. Postmark by ActiveCampaign

While Postmark built its reputation on reliable transactional email, its newer role under ActiveCampaign adds complexity and blurred pricing for developers. Mailgun delivers the same trusted inbox reach – with deeper deliverability tooling, open APIs, and freedom from marketing lock-ins.

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Why Sinch Mailgun?

Top reasons teams switch to Mailgun

  • Advanced deliverability and inbox placement testing

  • HIPAA, SOC 2, GDPR, and CCPA compliance

  • Transparent pricing with free tier (100 emails/day)

  • Dedicated IPs and full event logging

  • Developer-first REST API and SDKs in 5+ languages 

Image for Top reasons teams switch to Mailgun
Join over 150,000 businesses, including 8 of the 10 largest tech companies in the world

START FAST, SCALE CONFIDENTLY

Mailgun vs. Postmark: Email infrastructure that grows with you

Postmark is strong for simple transactional sends – password resets, receipts, notifications – but scaling often means hitting walls on event retention, reporting, and pricing tiers tied to ActiveCampaign’s marketing suite. Mailgun is purpose-built for technical teams who need flexibility, transparency, and control. 

Capability
Mailgun
Postmark by ActiveCampaign
Free Tier
100 emails/day, no expiration 
100 emails/month, no expiration
Event retention
30 days on all paid tiers 
45 days on all paid tiers  
Webhooks 
Full API/Webhook coverage 
Limited webhook support 
Dedicated IPs 
Included on Scale plans 
Available on higher tiers 
SDKs 
Node, PHP, Python, Ruby, Go, Java 
Node, PHP, Ruby 
Multi-region support 
US + EU data residency 
Primarily US data region 
Deliverability tools 
Optimize suite: inbox placement, blocklist, validation 
Basic monitoring; no advanced inbox placement or blocklist tools 

BUILT FOR DELIVERABILITY, NOT JUST DELIVERY

When inbox placement matters, Mailgun leads

Deliverability isn’t just about getting through SMTP. It’s about staying off blocklists, optimizing warm-up, and understanding why an email missed the inbox.

Postmark focuses on reliability but doesn’t match Mailgun’s data visibility or deliverability engineering support. 

Mailgun’s Optimize suite includes: 

Talk to an expert
Email dashboard with delivered rate of 97%

EMAIL EXPERTS AT YOUR SERVICE

Support that scales with your business

Mailgun customers work directly with seasoned deliverability engineers, not generalist support.

Postmark offers responsive email-based support, but not Mailgun’s enterprise-grade SLAs or deliverability consulting. 

Mailgun support advantages:

  • 24/7 chat and ticket support

  • SLAs available on Scale & Enterprise plans

  • 320+ years of combined deliverability experience

  • Dedicated onboarding & migration guidance 

Chat thread with Mailgun support

More Control And Flexiblity

Compare features: Mailgun vs. Postmark by ActiveCampaign

Mailgun’s open APIs, flexible SDKs, and data transparency give engineering teams more power over their email infrastructure. 

Feature
Mailgun
Postmark by ActiveCampaign 
Deliverability suite 
Inbox testing, blocklist, and other tools available in Optimize plans 
Basic monitoring 
Email validation 
Single, list, bulk with previews 
Basic single validation 
Dedicated IPs
Included (Scale plan and up) 
Add-on (business tiers) 
Logging & analytics 
30-day event history, BI integration 
45-day message retention 
Templates 
HTML, Handlebars, MJML 
Handlebars 
API & SDKs 
REST API + Node, PHP, Ruby, Go, Java 
REST API + Node, PHP, Ruby 
Compliance 
HIPAA, SOC 2, GDPR, CCPA 
SOC 2, GDPR 
Support 
24/7 support, SLAs, onboarding 
Ticket/email only 
Data residency 
US + EU regions 
Primarily US 
Transparent pricing
Clear, published tiers 
Variable under ActiveCampaign tiers; bundled marketing suite can affect pricing 
HIPAA 
✅ Yes 
❌ No 
SOC 2 
✅ Yes 
✅ Yes 
GDPR 
✅ Yes 
✅ Yes 
CCPA 
✅ Yes 
⚠️ Limited documentation 
SSO/SAML 
✅ Enterprise plans 
⚠️ Not available 

Compliance and Security

Compliance comparison

Mailgun’s compliance and data-protection frameworks are designed for regulated industries like healthcare, fintech, and SaaS. Postmark’s security stance is solid, but Mailgun goes further with regional data routing and enterprise identity integrations.

Shield with compliance certifications listed

Product Reviews & Ratings

What customers say about Mailgun

2.0 out of 5

Postmark on TrustPilot

4.2 out of 5

Mailgun on G2 

4.6 out of 5

Postmark on G2 

For us, at the volume we’re sending – every fraction of a percentage means a potential customer, and as a community of designers, it’s our job to create meaningful touchpoints. High deliverability ensures that our messages and our reach are seen; any improvement in our email program has a huge effect on our business.
Photo of Michael Sacca
Michael Sacca Vice President of Product at Dribbble
Mailgun has great ability in email delivery. It’s also really reliable as I have not heard my website users complaining about not receiving emails. The sort of new intuitive design makes me like Mailgun even more!
Lee P. Founder, small business

Pricing Comparison

Mailgun vs. Postmark: Transparent pricing at every scale

Mailgun customers report up to a 50% reduction in total sending cost after switching due to better deliverability, fewer add-ons, and no forced marketing suite overhead.

Mailgun
Postmark by ActiveCampaign
Free/Trial plans
Up to 100 emails/day free (no expiration)
Up to 100 emails/month (no expiration)
10,000 emails/month 
$15/month 
Starts at $15/month 
50,000 emails/month 
$35/month 
Starts at $55/month 
100,000+ emails/month
$90/month (includes dedicated IP) 
$115/ month (+ IP add-on) for 125,000 emails/month
1M+ emails/month 
Custom enterprise pricing with SLAs 
Custom pricing under ActiveCampaign tiers 

Use Cases

Choose Mailgun if you want:

  • Advanced deliverability monitoring

  • HIPAA-ready compliance

  • Scalable sending from 100k to millions/month

  • Global data residency (US + EU)

  • 24/7 support and onboarding help 

Image for Choose Mailgun if you want:

Use Cases

Choose Postmark if you want:

  • Simple transactional email for small apps

  • Clean API for basic notifications

  • 1:1 developer integrations with limited compliance needs

  • Short-term volume for simple use cases 

Postmark by ActiveCampaign logo

Migration Checklist

Switch from Postmark by ActiveCampaign to Mailgun

Switching from Postmark to Mailgun is simple with guided support and developer-ready docs. 

Migration Checklist: 

  • Step 1: Export Postmark templates and map to Mailgun’s Handlebars/MJML templates

  • Step 2: Update DNS (SPF, DKIM, DMARC)

  • Step 3: Recreate event webhooks (deliveries, bounces, opens

  • Step 4: Validate list health and sender reputation

  • Step 5: Gradually warm up IPs for new sending domain

FAQs

Frequently asked questions

Postmark focuses on lightweight transactional sending, while Mailgun adds advanced deliverability, analytics, and compliance for production-scale email programs.

Yes – 100 emails/day forever. Postmark’s free plan includes 100 emails/month.  

Yes. Mailgun supports HIPAA, SOC 2, GDPR, and CCPA compliance.

Mailgun provides documentation and support for setup, DNS verification, and IP warm-up.

Mailgun powers transactional and API-based sending, while Mailjet (also part of Sinch Email) handles marketing campaigns.

Explore beyond Postmark by ActiveCampaign

Mailgun has a variety of features for companies with large lists and bulk sending needs.

Solutions

Ensure every email hits the inbox
Email deliverability
Email list management
Email analytics

Use Cases

Read how other companies are using Mailgun
Email testing tool
Check sender reputation
Email reputation check

Published November 2025