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Currently all the emails I get when signing up for internet accounts I keep in a folder called "Accounts". Anytime I forget a username, or whether or not I have an account, I just search my emails.
I'm starting to move my data to a password protected password manager but was also wondering if it was a smart idea from a security standpoint to keep these emails in my account as it would be a treasure chest if someone gained access to my account.
edit: they're mostly the "welcome to X" type emails, not the "click here to activate ones". Most of them have a username or the name used during the signup process.
2no definitive answer here....all you'll get is opinions – mdpc – 2014-05-09T01:00:20.940
However, if someone did gain unchecked access to your e-mail account, any service that you may run that's dependent on it (Facebook, forum logins, banking sites, etc) would be compromised as well, regardless of whether you still keep those registration mails, because if you actively use such services, they quickly flood your account with mail, which can be quickly tracked back. – Doktoro Reichard – 2014-05-09T01:47:23.993