I didn't develop this (aside from an additional feature before its release), as that developer isn't around anymore, but Stuart asked me to take a look.
Email options:
Result from add-on:
The "Reply To" address or equivalent will be whoever sent the email (so it can be replied to directly).
Here's a screen capture demonstrating no redirection takes place when the add-on is disabled:
Email options:
Result from add-on:
The "Reply To" address or equivalent will be whoever sent the email (so it can be replied to directly).
Here's a screen capture demonstrating no redirection takes place when the add-on is disabled: