In Start Search type Regedit and hit the Enter Key.
Navigate to:
HKEY_CLASSES_ROOT*\shellex\ContextMenuHandlers
Create a new key named SendToMailRecipient.
Set its default value to:
{00020D75-0000-0000-C000-000000000046}
Reboot.
File Explorer not automatically refreshing can often be resolved by resetting the folder view settings.