Funnily enough, I am getting the notifications to new comments on this thread!

I'm also experiencing issues. I posted up about my issue and got pointed here by Trademe Community Admin Lucy. I'm not getting notifications of questions on my auctions, or from sales. I test my email address from different email clients and I get those.  The advice to have those emails set as safe-senders... there is no such ability in Gmail. Unless you create a specific filter and say "Never Block". However it's not a case of the emails being sent to spam, it's a case of the emails not even being receieved. If they were being sent to Spam, then yes of course it's an easy fix.