I may have an explanation for that. Gmail is very good at detecting waves of spam mails while the wave is being sent out. Basically, a (bunch of) hacked server(

I may have an explanation for that. Gmail is very good at detecting waves of spam mails while the wave is being sent out. Basically, a (bunch of) hacked server(s) start sending SPAM mails. After some messages google realizes that these servers have been hijacked and starts rejecting mails from them. If your address happens to be among the first of the spammer's list, you will be hit by these emails. Otherwise when they send to your address google has already stopped accepting mails from that (those) ip(s) and you don't receive anything. It looks like enjo's address comes way before than yours...