Mailtrap
Email API/SMTP Free plan: 4,000 emails a month (150 a day) for 1 domain.
Email
What you get
Transactional email through API or SMTP, plus webhooks and templates, for up to 4,000 emails a month from one domain.
How to get it
Choose Start for Free on mailtrap.io/pricing.
What it requires
No credit card required.
The catch
Only 150 emails a day from one domain, and logs are kept just 3 days.
From the official page · checked Oct 22, 2026