5점중 2점 받음

Why requiring a "+" in the recipient address ?? Almost nobody has a recipient address with a "+".

이 검토는 현재 부가 기능의 이전 (1.0) 버전에 대한 것입니다. 

Hi, this addon was made to fulfill the wishes of a single user I saw on IRC. GMail (and probably other services) route emails sent to e.g. [email protected] to [email protected].
GMail doesn't allow you to send emails as [email protected], but some services do. This extension is for people using services that do.
What's your use case? Feel free to checkout out https://blog.qiqitori.com/?p=194 or https://github.com/qiqitori/reply_as_original_recipient to see if any other branches (1.1, 1.2) address your needs.