Granger wrote:Terminate all accounts where the mail bounces with SMTP 5xx responses or the user dosn't opt-in to keep the account within a given timespan.
Whoa, are you crazy? Just because the e-mail associated with an account is no longer active doesn't mean the account itself is no longer active. People switch e-mail addresses, lose access to old e-mails and e-mail services shut down. I'm not even sure which e-mail is associated with my account! As your e-mail address is never really used for H&H stuff, people probably won't think about keeping it up to date. I know I've signed up for services with e-mail addresses that no longer exist but that I kept using long after I lost access to the actual e-mail address. And this is especially fucked up for people who have paid stuff on their account (verified, hats, etc).