I'm an IT guy. I installed this plugin and tested iｔ. I concluded it's very safe. Ｉ no longer need to enter username/password in my none SSL wp-login that prevents password sniffing from hackers. I directed the login email sent to email@example.com, so the email never left my server that makes it even more secure. It only takes couple seconds to receive login email. Further, I password protected \wp-admin，so Ｉ will need to enter that password to get into wordpress area. What a double protection. Since I don't have to enter wp-admin password anymore, so I changed the account password to a new one-hundred-character password. No body can break it. I've never use the new password, so no hacker ever had chance to sniff on it. A well-thought-out plugin. You should try it.
Pefect plugin for developers and for those who want to get freedom from remembering multiple password, just a single word will give you access to all of your wp sites,
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