Mailtrap

Mailtrap is a dual-purpose platform: email testing (sandbox) and email delivery (sending). The free tier is genuinely useful (4,000 emails/month, 100 contacts) with no expiration. For indie hackers, the key value is testing complex email workflows safely before hitting production—a feature developers need but often overlook.\n\nOn the sending side, Mailtrap starts at $15/month (10,000 emails) with all features included: transactional and marketing emails in one platform, dedicated IPs available, advanced analytics, and EU-hosted data for GDPR compliance. The platform sits between budget tools (Plunk, SendGrid free tier) and premium services (Postmark). What makes Mailtrap compelling: the sandbox testing alone justifies the platform, and sending prices are reasonable. Perfect for SaaS founders who need both email testing infrastructure and reliable delivery without the premium pricing of Postmark.