Recently, it has come to light that GitHub, Microsoft’s renowned code-hosting platform, has barred new users from registering accounts using Outlook and Hotmail email addresses. This move does not impact existing accounts. However, new users who attempt to sign up with these email domains will encounter a notification indicating that the 'email cannot be verified.' GitHub has yet to release an official statement explaining this policy shift. Nevertheless, feedback from users indicates that the restriction may arise from technical glitches within the email verification system or from anti-spam measures.

To navigate this issue, it is advisable for new users to choose international mainstream email services like Gmail or ProtonMail for their registration process, ensuring their email can receive international mail. If users are determined to use corporate or educational email addresses, they should verify beforehand whether their domain is under GitHub’s graylisting scrutiny and consider adding noreply@github.com to their email whitelist to facilitate smoother communication.