One of the country-code registrars (I forget which now) has addresses at the top-level domain! Like "foo@to" for the ".to" registrar.

Wow. I am shocked ;-) Have to rewrite some code now... 

if (/\@/) {
   # email looks valid...
}

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In reply to Re^3: On Validating Email Addresses by Thilosophy
in thread On Validating Email Addresses by dws

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