Examples
Sign-up confirmation, password reset, verification code, receipt, shipping notice and account alerts.
Transactional is not marketing
Newsletters and promotions depend on consent and need an easy unsubscribe. Transactional email is expected by the user, so it has its own rules and reputation.
Keep the two apart, for example with different senders or subdomains, so a poorly received campaign does not hurt your password email.
How to send: API or SMTP
With the HTTP API you get each message's id, can use an idempotency key so nothing goes out twice, and follow delivery, bounces and complaints through webhooks. The MepMail API is compatible with the Resend SDK.
With SMTP, any system that already speaks SMTP works, from WordPress to an ERP: in MepMail the relay is smtp.mepmail.dev, on port 2587 with STARTTLS.
Good practices
- Authenticate the domain with SPF, DKIM and DMARC.
- Use one idempotency key per message, so a retry never sends twice.
- Respect bounces and complaints: stop sending to addresses that bounced permanently.
- Keep marketing out of the transactional flow.
What it costs
In MepMail, Send is free up to 100 emails a day, no card. Pro sends 110,000 emails a month for US$ 29.