Please step through this and see if you can recreate it. To my knowledge, thunderbird shows emails that might be the right one while typing, and the user selects the correct one. That is, thunderbird does not create or edit the email address during this process.

Well, I click on “+ New Message”. I start typing my daughter’s email address, “daugh”. Thunderbird auto completes at this point with daughter@hot.mail.com. The period between the t and m is incorrect. “Daughter@hotmail.com” is in the “Contacts” address book and “Address Book” address book. There is nothing in my “Personal Address Book” or “Collected Addresses” address books. “Daughter@hot.mail.com” does not appear in any address book. I would like auto complete to not suggest daughter@hot.mail.com every time I compose an email for her. I can re-create this problem every time.