email testing tool: Mailpit (GoLang)

GitHub - axllent/mailpit: An email and SMTP testing tool with API for developers

Mailpit - email & SMTP testing tool

Mailpit is a small, fast, low memory, zero-dependency, multi-platform email testing tool & API for developers.

It acts as an SMTP server, provides a modern web interface to view & test captured emails, and contains an API for automated integration testing (read more).