I'm unable to send email from my mobile device. I used the QR code method to transfer my email account information from the desktop Thunderbird, to my mobile app. I am able to send & receive email via desktop version. I've confirmed the SMTP and password information is correct. I've uninstalled and reinstalled the app. I've selected "none" regarding password for outgoing mail. Error via mobile device: "Failed to send some messages" "Client host rejected: Access denied"