Posted by jonathan at 5:07pm EST on 02/25/2009
E-mail Client: Thunderbird 2.x
Method of Access to Gmail: IMAP
SSL Enabled? Yes
Problem: If you’ve ever been using Gmail and accessing it via IMAP and run into the error “Web login required (failure),” you know that you’re not a happy Gmail user.
What’s the solution? Gmail » Settings » Browser Connection > Always use https
Then, close down the email client and start it back up. It should be all cleared up and you should be able to send mail again.