Gmail filters most of them for my personal email ProofPoint filters most of them for my work email. Any legit ones I get I tend to quickly hit the unsubscribe link for.
If you are getting an overwhelming amount of them in your inbox then you have poor SPAM filtering in place or subscribed to a lot of legitimate lists.
Since you mentioned Thunderbird, I assume you are on a very cheap ISP or self host mail system with poor filtering.