OG email on fucking AOL, pretty much used for any site that I think is going to sell my data
gmail, vaguely important stuff (warranty info, email I give to friends if they need to send something, etc) - also pulls my AOL emails (and instantly puts like 90% of them in spam)
edu email, actually important stuff (mortgage info, bills, bank stuff, job apps, etc) only one that pushes notifs to my phone
work email, usually just updates on jira tickets and the like. I can probably count the number of emails I've sent from my work email on one hand.