Best Transactional Email · FREE
Best free Transactional Email (2026)
7 transactional email that offer a genuine free plan, ranked by entry price. Every figure links to the public page it was captured from — the vendor's own wherever the vendor publishes the number, otherwise the named public source — with the date we captured it.
Key takeaways
- Cheapest: MailerSend at $0/mo.
- Qualifying: MailerSend, Mailgun, Mailtrap, Postmark, Resend, SMTP2GO, Twilio SendGrid.
- Data current through: 2026-11-01. STALE marks a row whose price we have not re-checked at its source in over 30 days; a vendor with no published price is marked when any of its plans is. 2 of 7 rows below are marked.
Comparison
| # | Transactional Email | Entry price | Free | HIPAA | SOC 2 | Best for | Source |
|---|---|---|---|---|---|---|---|
| 1 | MailerSend | $0/mo | Yes | — | — | SaaS teams needing both transactional email and SMS from one API | mailersend.com |
| 2 | Mailgun | $0/mo | Yes | — | Yes | Developers needing a mature API with SDKs across 6+ languages | mailgun.com |
| 3 | Mailtrap STALE · 2026-09-03 | $0/mo | Yes | — | — | Development teams that want email testing (sandbox) and sending from one vendor | mailtrap.io |
| 4 | Postmark | $0/mo | Yes | — | — | Teams where transactional deliverability is non-negotiable | postmarkapp.com |
| 5 | Resend | $0/mo | Yes | — | Yes | Developer-first teams using React/Next.js | resend.com |
| 6 | SMTP2GO | $0/mo | Yes | — | — | Small businesses and developers wanting simple SMTP relay setup | smtp2go.com |
| 7 | Twilio SendGrid STALE · 2026-09-05 | $0/mo | No | No | Yes | High-volume senders needing SOC 2 attestation at scale | twilio.com |