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This doesn't work with all email services.

The only one I know of is Google. So gmail and private email hosted by Google Apps. Anyone know of other email services that work this way?

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Pretty sure most email services support this as the syntax is part of RFC 822. The problem is when certain websites ignorant of this standard, choosing not to validate email addresses with a "+" character.

We might be talking about two different thing. OP was referring to a feature of gmail that recognizes anything before a + as your username and still delivers the email to you, regardless of what's after the +. A common use of that feature is to put a note to yourself about where you used that email, like so michaelapproved+hackernewskolya@gmail.com. So, when you see a message to that address, you'll know where the person got your email from. I don't believe all email services/servers behave this way.

What you might be referring to is the syntax of the email address. Yes, it is syntactically correct to use a + in an email and not all email services/servers and web forms properly recognize that it is correct to use the plus.

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