cmalina said

After switching my gmail account setting for OAuth2 authentication, every time I send an email from my gmail it shows up as having been sent from another account I have on Thunderbird?? Big problem as they are separate clients of mine. Any ideas to solve this?? Thanks!

Thanks for listening - I fixed the problem

Good. For the benefit of others you may want to briefly explain what the fix was. Then mark the thread as 'Solved' with your fix. Thank you.

It recently started happening to me. i.e. I get an email addressed to my business email and click reply, send it and then I get THEIR next reply addressed to my personal email! When I go back to check, I see it was sent from my personal email!

For about a week now I find that I am sending emails from address 1, but they show up as being sent from both address 1 AND address 2, that is to say, the messages appear in both sent folders. And the people to whom the emails are sent only receive the one from address 2. So when they click reply the message goes to the address 2 and not to address 1 which is really very irritating. One's work and one's personal and I don't want them mixed up.

When I log into gmail, it reflects the same thing - ie a copy of what has happened on Thunderbird.

But when I send an email from gmail, it is okay, only shows being sent once from the correct account. So I'm assuming this is a Thunderbird problem.

Any idea what to do would be appreciated.