I have several email accounts and they all work as expected, however I have two with similar but different domain names that automatically link for some reason. Both are associated with my website and I am using the email service from my host. One goes to foo.com, the other to foo.net I have recently moved my website to another host and had to setup my emails again. This should be a simple task of changing the servers in Thunderbird, right? So I did that, but the SMTP server and email address keeps switching to the other account. I set up foo.com with my email address and password, then I go to foo.net and it has the .com info already there. If I change that to the .net info and go check the .com account, it has been changed to the .net info. I tried reverting the .net account back to the old server, but it copied that info right back to the .com account! There is a dropdown box on the main Account Settings page where you can choose any account for your SMTP, but it only displays one of these, whichever one is currently filled out. How do I un-link these accounts? They were not previously linked in any way - they each sent emails from their own .com and .net accounts.