A hood inbox is an email address where users can send an email to. This email gets thrown into the hood system and distributed to other platforms.
Example: You as a hood admin added the inbox "kibicara-my-hood-inbox" to your hood. John wants to send a message to all hood subscribers. He then uses his normal email program to send his message to "kibicara-my-hood-inbox@{{ domain }}". His message will be distributed to the other platforms and Sandra who is subscribed to your telegram hood bot gets John's message.
Just click on "Add a new platform connection!" and choose a name for the email inbox, as below:
Yes, if you want to stop relaying emails, just use the switch to stop email relaying.