Email as username and a password. Sign in with Google/Twitter/Facebook? No chance. While (c) is nice, and I have considered it for my own projects, it is impr

Email as username and a password. Sign in with Google/Twitter/Facebook? No chance. While (c) is nice, and I have considered it for my own projects, it is impractical because of greylisting[1]. See this comment from just a few hours ago about signing in to Medium: "The first time I used it the mail didn't arrive until the day after..."[2] [1] https://en.wikipedia.org/wiki/Greylisting https://en.wikipedia.org/wiki/Greylisting [2] https://news.ycombinator.com/item?id=14887204 https://news.ycombinator.com/item?id=14887204