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Reviewed · Updated 2026-06-19

Mailgun

Developer-focused email API platform for sending, receiving, and tracking emails at scale.

Reviewed by the Conversion Gems editorial team ·
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Pricing
Free
Best for
developers
Category
Email Marketing
The bottom line

Best-in-class transactional email API for developers; pay-as-you-grow pricing suits startups to enterprises.

7.2
Our score
7.2 / 10
Conversion Gems editorial verdict
Free (100 emails/day); paid from $15/mo
Features8/10
8 - robust API, inbound routing, webhooks, templates, validation, dedicated IPs; no visual campaign builder.
Value7/10
7 - competitive mid-market pricing but free tier is stingy and dedicated IP add-ons are costly.
Ease of use6/10
6 - excellent docs for developers; steep curve for non-technical users with no drag-and-drop UI.
Ecosystem8/10
8 - REST API integrates with virtually any stack; official SDKs, Zapier, and major CRM connectors available.
Support6/10
6 - ticket support on free/basic tiers; live chat and phone only unlocked at Scale ($90/mo).

Community ratings

4.1/ 5 aggregate · across 2 sources
G2
4.2310+ reviews
Trustpilot
4.11,400+ reviews

Third-party ratings shown verbatim; aggregate weighted by review volume.

What it really is

Mailgun — developer-first transactional email API and SMTP relay platform.

Our take

Mailgun is the go-to transactional email API for developers who need reliable programmatic sending, real-time analytics, and inbox validation at scale. The DB lists this under 'Email Marketing' and marks it free-only — both are mislabels: Mailgun is a transactional/developer email platform (not a campaign builder), and its real model is freemium with paid plans from $15/mo. The free tier covers only 100 emails/day — useful for testing, not production.

Why we rate it

Mailgun offers one of the most mature transactional email APIs available — battle-tested by thousands of SaaS apps, with granular webhook events, detailed send logs, and robust validation tools that genuinely improve deliverability. Foundation and Scale tiers include a one-month free trial, lowering the commitment barrier.

The catch

The free tier caps at 100 emails/day — barely enough for development testing. Costs escalate quickly at volume, dedicated IPs are a steep $59/IP/mo add-on, and phone/chat support is locked behind the $90/mo Scale plan.

Best for
Developers integrating transactional email into web or mobile apps
SaaS companies needing high-volume, reliable email delivery with audit logs
Teams requiring advanced deliverability tools like dedicated IPs and inbox validation
Not good for
Non-technical marketers who need a drag-and-drop newsletter builder
Tiny senders who need free bulk marketing email (100/day cap is very restrictive)
Teams on a tight budget at scale — overages and add-ons add up fast
Friction report
Time to value
Fast: API keys are available immediately after signup; first send possible within minutes using the REST API or SMTP relay.
Scale breakpoint
Overage rates ($1.10–$1.80 per 1,000 emails) and per-IP add-on costs ($59/mo) make large-volume sending expensive; dedicated infrastructure requires Scale plan at $90/mo minimum.
Walled garden
Low: standard SMTP and REST APIs mean you can migrate sending infrastructure to another provider without rebuilding app logic.

A look inside

Mailgun product screenshot

Frequently Asked Questions

Alternatives

Step up

SendGrid or Postmark for enterprise-grade deliverability services and richer analytics dashboards.

Lighter alternative

Brevo (free up to 300 emails/day) for smaller senders who need both transactional and basic marketing email.

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Tags

#EmailAPI#Developers#Deliverability

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