[Request]: add mailpit

[dodumosu]

Prerequisites

• [X] I have searched all issues/PRs to ensure it has not already been reported or fixed.

Criteria

• [X] Non-GUI tool
• [X] Reasonably well-known and widely used (e.g. if it's a GitHub project, it should have at least 500 stars and/or 150 forks)
• [X] English interface (or at least English documentation)
• [X] Latest stable version
• [X] Full version (i.e. not a trial version)
• [X] Fairly standard install (e.g. uses a version-specific download URL, no elaborate pre/post install scripts)

Name

mailpit

Description

mailpit is a SMTP testing tool that does most of what mailhog does and can replace it

Homepage

https://mailpit.axllent.org/

Download Link(s)

https://github.com/axllent/mailpit/releases

Some Indication of Popularity/Repute

the project has 4k+ stars and 100+ forks on Github. it's a close replacement for the now unmaintained mailhog