Validating an email address
From Achievo/ATK Wiki
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ATK Howto: Validating an email address
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The validation of an email address is easy, just add the email attribute to the node with the email address like this:
$this->add(new atkEmailAttribute("email", false, AF_OBLIGATORY));
The atkEmailAttribute contains a validation for an email address which will be called automatically, if the second parameter of the constructor is set to "true" a DNS check will be performed on the address domain as well.
Check the functions validateAddressSyntax() and validateAddressDomain() in class.atkemailattribute for details of the validation.
