Wouldn't that also present an issue with usual password logins?

dude, how many fucking email addresses do you have then?

Not OP, but I do the same thing using wildcard addresses on a domain I own. I might use [email protected] for Hacker News, [email protected] for Amazon and so on.

Foregoing the custom domain, some email providers also let you add tags to your address (e.g. [email protected]). I'm aware of some people who use that functionality to have unique email addresses for each service.

I also use this method. Thanks to it I usually can check if e-mail was automated and also I am not disturbed by e-mails with social media notification, shop promos or marketing spam during work. Also some e-mail providers allow to create many e-mail aliases which shares the same inbox.

Some of us use [email protected]. It gets delivered to the same [email protected]. Other mail providers probably offer the same convenience.

Some nasty login forms block the '+' symbol from being used.

I sometimes use multiple dots to create an alias, but it only works for a fraction of e-mail providers (i.e. GMail). E.g.: [email protected] is the same as [email protected].

FastMail supports [email protected]

> dude, how many fucking email addresses do you have then?

  $ ldapsearch -LLL uid=dozzie mail | wc -l
  115

Is it supposed to be ridiculous or what?