I run my own mailserver, for better or for worse, and I use SpamAssassin to catch spam. For years I have been tucking it away in a folder. Guess how much was there? Give up? Nine gigabytes! Thanks, spammers!
Absurd! Gmail deletes mine after 30 days, so I don’t really get to count…
I’ve got all of my mail going back to about 1997. At first, spam was rare, so I think I just deleted it for a few years.