Problem with account settings
I work at the company, where we have several inboxes on Thunderbird. I can not send any e-mails, the error: Message sending failed. An error occurred while sending the message. Mail server response: tetiana@sleepinginkrakow.com: Sender addres rejected: not owned by user office@sleepinginkrakow.com tid:[21114]. Please verify the correctness of the email address in the account configuration and try again.
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The error is saying that you are trying to send from tetiana through an smtp server that accepts only office.
You must have an smtp server for each account, tetiana, office etc., and set each account to connect to the smtp that has the same User Name (email address):