Ask HN: Emailing users their passwords outdated?

Hey guys, wondering what your thoughts are on emailing a user their password, upon registration for example. A lot of sites still send you a record of your username/password when you register. It feels like an outdated practice and a security flaw because of changes to the way we use email. I recently had my Gmail compromised, and like most people, having all the space I need means I never need to delete anything which is convenient but also a security risk. I wondered what would happen if they downloaded my entire inbox and sorted through all emails with the text "password" in it. I'd have a lot of accounts on different services exposed. Thoughts?