So, who do you imagine will stop it for you? Do you not imagine that we all have spam? And why are there so many suppliers (Norton, McAfee, Avast, Avira, Eset, Kaspersky, Panda, etc etc) selling various defences against spam? The fact that they all continue to remain in business tells us that it is a non-trivial problem. If you have an IMAP-connected account and it has a Bulk Mail folder, then your email provider is almost certainly filtering messages into it. And I'd think he was doing you a favour by handling your spam for you. You could unsusbscribe such a folder (in Thunderbird) and you'd never see your "bulk" messages again. But I wouldn't do that myself since these systems make mistakes and occasionally mis-classify good messages as junk/spam/bulk (And if you don't have IMAP and a "bulk" folder, I'm curious as to why you chose the word "bulk" to describe your nuisance messages.) Are you using the Junk Controls in Thunderbird to help train it to recognize junk/spam/bulk?