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Thunderbird sending message from wrong email

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When I send (or reply to) an email from my main account, it is sending as from a different account. It does not do this when I am sending through a normal browser or other apps, only Thunderbird. I recently signed up for Google Authenticator and changed the 'Authentication method' under 'Security Settings' to 'OAuth2'. Everything went fine except this. Any advice?

When I send (or reply to) an email from my main account, it is sending as from a different account. It does not do this when I am sending through a normal browser or other apps, only Thunderbird. I recently signed up for Google Authenticator and changed the 'Authentication method' under 'Security Settings' to 'OAuth2'. Everything went fine except this. Any advice?

Chosen solution

It looks like you have to check that the correct smtp servers are assigned to the corresponding sending accounts:

https://support.mozilla.org/en-US/questions/1172228

Gmail is one service that requires the account to match the smtp server.

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Chosen Solution

It looks like you have to check that the correct smtp servers are assigned to the corresponding sending accounts:

https://support.mozilla.org/en-US/questions/1172228

Gmail is one service that requires the account to match the smtp server.

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Thank you so much sfhowes, I really (really) appreciate the quick, informative response!!!