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Free Email API Limits Compared
How many emails each transactional email service lets you send for free each month and each day, and the catch that comes with it. Every row links to the dated listing and the vendor's own pricing page. Last checked .
| Service | Free emails / month | Daily cap | Catch | Checked |
|---|---|---|---|---|
| Mailjet (Free) | 6,000 | 200 | Mailjet logo on free emails | source |
| Mailtrap (Free) | 4,000 | 150 | Quota shared between sending and receiving | source |
| Loops (Free) | 4,000 per rolling 30 days | No daily cap (10 emails/second) | Counts marketing and transactional together; Loops footer | source |
| Resend (Free) | 3,000 | 100 | Daily cap bites before the monthly limit | source |
| Mailgun (Free) | No monthly figure | 100 | 1 day of logs, 1 sending domain | source |
| Brevo (Free) | No monthly figure | Up to 300 | Sending starts after account approval | source |
| SMTP2GO (Free) | 1,000 | 200 (extra queued) | Sends rejected once the monthly quota is used | source |
| MailerSend (Free) | 500 | 100 API requests | Card required at signup (not charged) | source |
| Postmark (Free) | 100 | None stated | Overages not allowed; meant for testing | source |
FAQ
Which email API has the biggest free tier?
By monthly volume, Mailjet allows 6,000 emails a month (200 a day), then Mailtrap and Loops at 4,000 and Resend at 3,000 (100 a day). Brevo has no monthly figure but allows up to 300 a day. Limits are copied from each vendor's pricing page and dated.
What happens when I hit a free email daily limit?
It depends on the vendor. SMTP2GO queues emails over its 200-a-day cap and sends them the next day, but rejects sends once the 1,000 monthly quota is used. Resend, Mailgun and Mailtrap have hard daily caps on their free plans, and Postmark does not allow overages.
Can I use a free email tier for production?
For low volume, yes, with care. Daily caps (100 a day on Resend and Mailgun) can block password resets during a signup spike, and some free plans add vendor branding (Mailjet, Loops) or are meant for testing (Postmark's 100 a month).
See also: Email · Daily Limits · Free Tier Fine Print