Mailgun vs Postmark

Two transactional email providers, compared on price, features and ratings, so you can pick fast.

Mailgun wins flexibility and compliancePostmark wins speed and simplicity

Updated September 2026

At a glanceMailgunPostmark
Entry price$0.80$10
Cost per 1k @ 100k$0.9$1.26
Free tier100/day100/mo
G2 rating4.54.6

THE VERDICT

Mailgun wins on flexibility and compliance. Postmark wins on speed and simplicity.

Both are developer-grade transactional ESPs starting at $15/mo. Mailgun is the more flexible infrastructure play, usage-based pricing, EU data residency, ISO 27001, and a HIPAA BAA, built to scale and handle regulated sends. Postmark is the deliverability-and-speed specialist, with 45-day log history and a strong support reputation, but it's US-only, won't sign a BAA, and skips marketing features.

Which should you choose?

Pick Mailgun

✓Usage-based pricing that scales with volume
✓EU data residency, ISO 27001, and a HIPAA BAA
✓Built-in email validation (add-on)
Set up Mailgun with Courier →

Pick Postmark

✓Fast transactional deliverability and clean reputation
✓45-day log retention out of the box
✓Simpler, focused, code-first workflow
Set up Postmark with Courier →

Feature by feature

Winner cells are tinted, green where Mailgun leads, violet where Postmark does.

capability
Mailgun
Postmark
Starting paid plan
$15/mo
$15/mo
Cost per 1k @ 100k
$0.9
$1.26
Pricing model
Hybrid
Subscription
Overage
from $1.10 / 1,000 emails
$1.20–$1.80 per 1,000 by plan
Dedicated IP
Plan-gated
Add-on
Deliverability tooling
Yes
Yes
Automated IP warmup
Yes
No
Suppression management
Yes
Yes
SPF / DKIM / DMARC
Yes
Yes
Transactional API
Yes
Yes
Marketing campaigns
—
No
SMTP relay
Yes
Yes
Inbound routing
Yes
Yes
Dynamic templates
Yes
Yes
Batch send
Yes
Yes
Scheduled send
Yes
No
Official SDKs
Python, Ruby, PHP, Java, Node.js, Go
.NET, Java, Node.js, PHP, Python, Ruby, Rails
Event webhooks
Yes
Yes
Drag-and-drop editor
Yes
No
Custom HTML editor
Yes
Yes
Email validation
Add-on
No
Log retention
1-30 days
45 days
Sandbox / test mode
Yes
Yes
Open / click tracking
Yes
Yes
Analytics dashboard
Yes
Yes
A/B testing
Yes
No
EU data residency
Yes
No
SOC 2
Yes
No
HIPAA
BAA
No
GDPR
Yes
Yes
ISO 27001
Yes
No
Support channels
Email/ticket, Chat, Phone
Email, Chat
24/7 support
—
No
Support SLA
Plan-gated
No

FAQ

Common questions

Postmark is specifically known for fast transactional delivery and a clean sending reputation; Mailgun offers more deliverability tooling and controls at scale.

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Why not both?

Use both behind one API.

Route Mailgun, Postmark, or both, and switch providers without changing your code. Courier sits in front of every channel.

Start building freeRead the docs

Pricing, plans and feature availability as of September 2026 and may change. Ratings are aggregated from public review platforms. Mailgun is a Sinch product; Postmark is an ActiveCampaign product.