Email plus

October 21, 2009 Comments Off on Email plus

The local-part (everything before the @) of an e-mail address may use any of these ASCII characters:

  • Uppercase and lowercase English letters (a-z, A-Z)
  • Digits 0 through 9
  • Characters ! # $ % & ‘ * + – / = ? ^ _ ` { | } ~
  • Character . (dot, period, full stop) provided that it is not the first or last character, and provided also that it does not appear two or more times consecutively.

Other piece of knowledge:
If your gmail is, Gmail accepts, and that is a literal + there!

So you can (like many others out there) use that to your advantage to track if and how your email address has been sold. Example: you register for a newsletter of company XYZ, so you register with If at some point you receive unsollicited mail, and upon checking you notice that it was sent to, you know that XYZ’s database with emails has either been compromised or sold. You could then set up a SPAM rule in gmail for example, and if you’re really brave, sue XYZ 😉

Now what annoys me, is that there are still javascripts out there that check email validity and don’t accept +. Dutch bloggies, for example, doesn’t accept Why, why? Is it because they have bad intentions (probably not), or that they are just plain stupid (also weird for the organiser of a competition of best blog)?


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