even after using a paid subscription you only allow to track emails sent from the registred email id with right inbox
i cant track email sent from any other gmail ID even after having a premium subscription and this is unfair as other services allows to track email from any email id once you have a premium plan and chrome extension installed
people have multiple ID of gmail buy a subscription for each ID is not someone is looking for
once the extension gets authorized by the main registered email ID you should allow to track emails from other Gmail ID using the same browser too

Email us at support@rightinbox.com we allow 3 emails to be associated to 1 subscription for cases like this

you are not giving any reply on the email whereas on your FAQ you have mentioned that you set it up the same day
if you cant handle the request of the users why dont you make a dashboard on rightinbox where user can login on the website and manage their account themselves?