Hi Bob Only you will know how accounts were setup in the app. Did you import your accounts from Thunderbird desktop via QR code or manually add them? You can easily remove accounts you don't need/want by navigating to .. Settings > account > 3 dot menu (top right of screen) > remove account. Unified inbox is automatically enabled when more than one account is present. It shows a combined view of inbox content from multiple accounts in one place. It can be turned of by going to: Settings > general settings > display > show unified inbox. For the account your unable to sent emails from, can you navigate to ... Settings > account > sending mail > outgoing server. Click next on the page. This will test the configuration and connection to the server. Are any errors reported? Who is your email provider?