Why Build Another One?

Fair question. There are already established tools in this space that work well. But we kept running into limitations at our company. Pricing got steep as our team grew, and we wanted some features that weren't available or required jumping to expensive enterprise tiers. So we built our own solution that fit our needs, and figured others might find it useful too.

What It Does

Mailloop catches emails sent via SMTP and displays them in a web interface. Connect your app to our SMTP server and test email sending without hitting real inboxes. It works with any language or framework that supports SMTP. You get standard protocol support, TLS/SSL encryption, and credentials that just work. No configuration hassle, no risk of accidentally sending test emails to real users.

Each sandbox gets its own dedicated email address that can receive emails from external sources. This is useful for testing webhooks, third-party integrations, or any scenario where emails come from outside your app. All incoming emails are captured instantly and ready to inspect.

We also built a testing library that lets you verify emails directly in your test suites. Create temporary email addresses, send via SMTP, and assert on what was received. The SDK integrates cleanly into CI/CD pipelines, so you can catch email issues before they reach production. Beyond just capturing emails, we added deliverability analysis that checks spam scores, validates authentication (SPF/DKIM/DMARC), and verifies blacklist status.

Who It's For

Developers and teams who need to test email functionality. We're keeping pricing affordable for small teams while offering the features we actually use.

Getting Started

Head over to mailloop.io to create a sandbox. You'll get SMTP credentials immediately and can start testing right away.