e-hoarder
Someone who keeps every email they ever got, even the ones from people who don't know who they are anymore. They're like a spam folder with a personality.
"I kept that email from 2012 about free pizza because I thought it might come true.", A guy who still checks his inbox every day.
"I have 500 emails from my ex about the same fight.", A woman who can't let go of the past.
"I didn't delete that email from my old boss even though he's dead.", A guy who's still scared of his old job.