I've done some research and can't find the answer to my question. Apologies if it's there and I missed it. I have several Gmail accounts, but only one Thunderbird that I use exclusively for work. Today, an email from one of my Gmail accounts showed up in my Thunderbird mail randomly. In the To field, it literally has my Gmail listed. I thought perhaps the Gmail address was set up to work with Thunderbird so I went through the process of "removing" it, despite never having set it up in the first place. As I suspected, the ONLY email associated with my Thunderbird was my Thunderbird email. So, there was no other account to remove. I don't know what I'm missing or how this email from an unassociated Gmail account could appear in my Thunderbird inbox. Any thoughts or suggestions? Thanks in advance.