What the free plan includes.
- 3,000 emails per month, up to 100 per day
- 5 verified domains with DKIM
- API keys with permissions, domain restriction and expiry
- Inbound email to signed webhooks
- Templates with {{variables}} and Campaigns
- Email activity with per-recipient delivery status
No credit card is needed. Create an account, confirm your email address, add your domain and create an API key.
Send your first email in minutes.
- Create a free account and confirm your email address.
- Add your domain and publish the DNS records, or let Mailumi add them on Cloudflare.
- Create an API key with the Send email permission.
- POST to /api/v1/emails with from, to, subject and html or text.
When to upgrade.
Upgrade when you need more than 100 emails a day, more than five domains or more than 3,000 emails a month. Pro includes 50,000 emails and 10 domains for $20 a month, and Scale includes 250,000 emails and 100 domains for $80. Switch or cancel at any time.
Free email API plans compared
| Provider | Free allowance | Time limit |
|---|---|---|
| Mailumi | 3,000 emails/month (100/day), 5 domains | None |
| Resend | 3,000 emails/month (100/day), 3 domains | None |
| SendGrid | 100 emails/day | 60-day trial |
| Mailgun | 100 emails/day, 1 domain | None stated |
| Postmark | 100 emails/month | None |
Free plans from each provider’s public pricing page, checked 7 October 2026.
Free email API: common questions
- Is the Mailumi email API really free?
- Yes. The Free plan costs $0 and includes 3,000 emails per month with up to 100 per day. No credit card is required and the plan does not expire.
- What happens when I reach the free limit?
- Sending pauses until the next day for the daily limit, or until your next monthly period. Upgrade to Pro at any time to keep sending.
- Can I use the free plan for a production app?
- Yes. The Free plan uses the same API, domain verification and delivery as the paid plans. It suits apps that send fewer than 3,000 emails a month.
- Which free email API has the biggest allowance?
- Of the providers compared here, Mailumi and Resend both include 3,000 free emails per month and Mailgun allows 100 per day. SendGrid’s free option is a 60-day trial, and Postmark’s free plan includes 100 emails per month. Checked 7 October 2026.
Sources
Sources checked . Third-party features and prices may change.