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I cant send email
Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) mail.btinternet.com. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'.
Opaite Mbohovái (1)
you have shared no information, so no one can respond. If you post a screenshot of your SMTP settings pane, someone here may have suggestions.