Mailgun
Free plan ($0): 100 emails a day through the email API and SMTP relay, 1 custom sending domain.
Email
What you get
Transactional email API and SMTP relay with 100 emails a day, tracking, webhooks and 1 custom sending domain.
How to get it
Choose the Free plan on mailgun.com/pricing.
The catch
Capped at 100 emails a day, logs are kept 1 day, and only 1 user is allowed.
From the official page · checked Oct 22, 2026