I have 3 GMail accounts. Never had any problem with them before. All accounts are IMAP. A week ago, one of the GMail accounts will not receive or send emails (the other 2 gmail accounts don't appear to have the same problem). I've tried all the suggested fixes: allow less secure apps, check server settings, check email password. Deleted the problem account, and reset it. (this worked for a couple of hours but has stopped working again). I can get the emails by using direct Mail at GMail, but I want to continue to use Thunderbird.