I see Porn spam, Vitamin Spam, Pyramid Scam Spam, 'This is not a pyramid scam'-pyramid scam Spam, etc. Most of isn't to me, it's to my users. Spammers don't like to remove addresses from their lists, and 'one-time' spammers that buy a list don't care, because they only use it once. So, every day I get mail addressed to people who have quit, or are dead. It's all Spam.
Real humans update their email address lists.
I never get personal correspondance for the dead guy. I know you could care less. But if I can find a way, I'll stop you. Your email will never reach anyone in my domain, if I have anything to say about it. Spam makes people hate your product and loathe your service.