[Boost-users] Spamming through boost???

Hi all! I give to all my opponents personalized email addresses, e.g. for boot my email is om_boost@domain_name.ext. Today I got my first spamming email to this address. Now I really think, there must be email servers inbetween, which simply log the sender and put them to the spamming lists. I don't see any other possiblity of how this can happen. I don't beleave that boost sells email addresses to spammers, after I know you guys. Would be nice to know what others think. I know that this email is off-topic, but can be useful anyway. With Kind Regards, Ovanes