I am managing around 30 email addresses. Sometimes I use a wrong email address to send an email then often receive a reply "Who are you ?" afterward.
For example, I always use
firstname.lastname@example.org to contact my sister, but someday I use
email@example.com by mistake then my sister will get confused.
Thus, I am looking for a way to make Thunderbird warn me if I use the email address which never been used before to contact the receiver. As an example above, Thunderbird will ask me if I really want to send email with
firstname.lastname@example.org because this email has never been used to contact my sister.
I think I want something (maybe a Thunderbird's add-on) that store for each contact email address a list of emails we have used to contact to, then whenever we're going to send an email, if the email address is not in the list Thunderbird will make a warning.