E-mail validation -Official rule-

[Cesark]

I have an e-mail validation function according to the official rule achieved here :D and it seems reliable, anyway I need to find the organization and the document where this rule is defined, I suppose that in the W3C (World Wide Web Consortium) http://www.w3.org/ , but I can not achieve to find the document in this site.

Somebody can help me finding the original rule and the updates?

Thanks,
Cesar