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What's so hard about RFC-822 addresses?

2010-11-24 , ,

Ran across another website with a broken shopping cart that would not accept my email address and abandoned an order tonight. It’s clear from RFC-822 (ok, at least to technical folk) that the list of characters that may not appear in the atoms composing the local portion of an email address are:

  • space
  • parenthesis “(”, “)”
  • brackets “[”, “]”
  • at sign “@”
  • semi-colon “;”
  • colon “:”
  • period “.”
  • greater than sign “>”
  • less than sign “<”
  • comma “,”
  • quotation marks

What is so hard about this list dating back to 1982 that web-form validation can not get it right?

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