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It's part of the specification ... Anything after the plus sign is considered a comment.

• sp332 11y ago
  I'm pretty sure that's not true. '+' is allowed in an email address, but it's just a normal character, not a comment. Comments are made with parentheses. https://en.wikipedia.org/wiki/Email_address#Syntax https://en.wikipedia.org/wiki/Email_address#Syntax
  • silix 11y ago
    you need to scroll down in your link. https://en.wikipedia.org/wiki/Email_address#Sub-addressing https://en.wikipedia.org/wiki/Email_address#Sub-addressing
    • sp332 11y ago
      That's a different "spec" which may or may not be implemented by any given email provider.