I think that means you need to offer your password when sending email. This is known as authentication. These error messages are very often misleading. I doubt there is anything wrong with your email address. To cut to the chase… In order for us to better investigate this issue you need to add a little more non-personal information. Please add the troubleshooting information to your post. To find the Troubleshooting information: * Open '''Help''' (or click on three-line-icon and select '''Help'''). * Choose '''Troubleshooting Information'''. * Clear the check box '''Include account names'''. * Use the button '''Copy to clipboard''' to select all. * Paste this in your post. Please post back with this information and any other questions you might have.