The Windows Live Mail is an old email client program developed by Microsoft, and it was stopped five years ago. Still, you can continue to use the latest version for basic email tasks. When you access the emails on the Windows Live Mail, you come across the error 0x80004003 that indicates the SMTP error. Continue to read the reasons causing the 0x80004003 Windows live mail error and the different ways to resolve it.
Verify the SMTP server settings
Remove and re-add the email account
Make Windows Live Mail app default