Every side project needs a reliable way to send auth emails, password resets, and notifications. If you’re looking for a service with a solid developer experience and a generous free plan, here are the best options:
Resend
The modern favorite for many developers. It has a fantastic API, excellent documentation, and first-class support for React Email.
Free Tier: 3,000 emails/month (100/day limit).Postmark
Known for having some of the best deliverability rates in the industry. It’s a "developer-first" platform that strictly separates transactional and marketing streams.
Free Tier: 100 emails/month (no expiration, no credit card).Mailjet
A solid choice if you need a higher monthly volume for a small user base.
Free Tier: 6,000 emails/month (200/day limit).MailerSend
Built by the team behind MailerLite, this is a highly intuitive transactional service with a focus on simplicity.
Free Tier: 500 emails/month (100/day limit).SendGrid
The industry standard. While the free tier is modest, it’s a great way to learn the platform that many enterprise companies use.
Free Tier: 100 emails/day.Mailgun
A powerful engine for teams that need deep tracking and complex routing.
Free Tier: 100 emails/day.Mail Trap
Provides an email API and SMTP relay with separate sending streams for transactional and bulk email, keeping sender reputations isolated by design. Analytics drill down by mailbox provider and stream on every paid plan.
Free Tier: 4,000 emails/month (no credit card required).
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