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GLPI uses a "popular method" for parsing/validating email addresses
Unfortunately the "popular method" is WRONG as it relies on a number of assumptions made by someone who didn't bother actually reading mail standards before writing the parser.
Among other things it will disallow email addresses such as fred+mailbox@dom.ain
There is a "Correct", RFC-(2)822 standards-compliant PHP mail parsing module at http://www.iamcal.com/publish/articles/ … sing_email
current version at http://code.iamcal.com/php/rfc822/
The full regex (23kB) is at http://code.iamcal.com/php/rfc822/full_regexp.txt
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