Due to overzealous filtering on Microsoft’s side, some emails to Outlook and Hotmail addresses may not be delivered. If you’re affected, please use a different email address or try again later.
I had the same problem and finally I browsed the Rage forums for awhile and found a fix that worked for me. I added the GTA V root folder (the main game files folder) to the list of exceptions in my antivirus and voila back to normal.