I had everything going to spam with Gmail. I also had my Gmail account added to Microsoft Outlook where there wasn't a Spam folder, so the messages didn't show up at all. One day I realized I could login to my Gmail account through the website and bam, there they all were in the web-based spam folder. So I added the sender to my address book and it fixed it. I worry about anyone who doesn't notice all their notifications are being sent to spam, especially people just trying to register and not getting their notification email that's needed to activate their account.