Hi,

it seems that you are using extensionless. Using URL of above format the system cannot decide if .com is an extension or it is a part of email.

You could change the URL and pass it as: name@surname-com
Then in a web part you can recover the original e-mail using: {%username|(replate)-|(with).%}

Above solution would work, but in case there will be an additional "-" in the e-mail it will not work correctly. You would need to use some different characters.

You can change the webpart to work with UserID instead of UserName. This way the correct user will be displayed each time.

Best regards,
Ivana Tomanickova