Mailgun by Sinch is an email delivery service engineered for developers sending transactional and marketing emails at scale. It provides an HTTP API, SMTP relay, inbound email parsing into webhooks, and deliverability tracking. The free Developer plan includes 100 emails per day, 1 custom sending domain, 1 inbound parsing route, and standard delivery analytics with no credit card required.
Free tier quotas
Daily Sending Volume
100 emails/day (approx. 3,000 emails/month)
Custom Domains
1 verified sending domain
Inbound Routing
1 inbound route to convert incoming email to HTTP webhooks
Log Retention
1 day of event history and delivery logs
Sending Protocols
RESTful HTTP APIs and SMTP relays
API Keys
2 active API keys
Not yet verified. Always confirm on the official pricing page.
👍 Good boy
+Processes transactional email on high-throughput infrastructure built for reliability.
+Parses inbound incoming emails into structured JSON webhooks with attachments intact.
+Supports both modern REST APIs and legacy SMTP relays with SDKs for all major languages.
+Free Developer plan allows testing integrations with 100 emails per day without a credit card.
👎 Watch out
−Log retention on the free tier is limited to 24 hours, necessitating external log storage.
−Daily cap of 100 emails restricts handling unexpected user sign-up spikes.
−Free accounts permit only 1 user seat and provide ticket-only support.
−Dedicated IP pools require upgrading to the Foundation or Scale tiers.
The catch
Logs are retained for only 1 day on the free tier, and sending is capped at 100 emails daily.
Free tier value
Generosity
A
Estimated value
$15/mo
Feature parity
Includes REST API, SMTP relay, 1 inbound route, and 1 custom domain with daily sending limit
Screenshots
Mailgun Free and Paid Plan Pricing OverviewMailgun Official Icon and Application BadgeMailgun Platform Favicon and Brand Mark
