I attended my town's meeting for a political party in 2016. I put my name and email on the list with an email address that I made up on the spot. It continues to get HAMMERED by every up-and-coming politician in the state who's trying to make a name for themselves.
A few years ago I attended Senator Ed Markey's roadshow for the Green New Deal. I again used a unique email address. Someone on the staff sent the address a LinkedIn invite promoting their puppet show business.
I interviewed with Microsoft in the fall of 2004 and used a unique email address on the application. It started getting SPAM. I think I blocked it in my email provider.
Looking in my SPAM folder, most of the spam is going to my gmail account, and most of it is recruiter spam. (There are a lot of recruiters who just SPAM, and I report them.) But: I have 2 emails in German to an email address I used with the Computer History Museum in Mountain View probably sometime between 2005-2007.
Speaking of resume spam: Next time I publish a resume I'm going to do "jobboard_year@...". I'm getting hammered with resume spam, a lot of it from recruiters who either haven't read my resume, have poor comprehension, or hit send with glaring errors.
Years ago I blocked a bunch of addresses in my email provider that I never used. (I'm not going to look them up now.) They were very random, but somehow they just kept getting emails. I have no idea why.
And finally: In 2003 I put out a resume with "resume@..." That got hammered with SPAM. A repeat offender was someone trying to sell a car detailing franchise. I had to block that address.