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/usr/share/php/smarty3/plugins/validatecriteria.isemail.php is in smarty-validate 3.0.3-2.

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<?php

/**
 * Project:     SmartyValidate: Form Validator for the Smarty Template Engine
 * File:        validate_criteria.isEmail.php
 * Author:      Monte Ohrt <monte at newdigitalgroup dot com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * @link http://www.phpinsider.com/php/code/SmartyValidate/
 * @copyright 2001-2005 New Digital Group, Inc.
 * @author Monte Ohrt <monte at newdigitalgroup dot com>
 * @package SmartyValidate
 */

 /**
 * test if a value is a valid e-mail address
 *
 * @param string $value the value being tested
 * @param boolean $empty if field can be empty
 * @param array params validate parameter values
 * @param array formvars form var values
 */

function smarty_validate_criteria_isEmail($value, $empty, &$params, &$formvars) {

    if(strlen($value) == 0)
        return $empty;

    // in case value is several addresses separated by newlines
    $_addresses = preg_split('![\n\r]+!', $value);

    foreach($_addresses as $_address) {
		$_is_valid = !(preg_match('!@.*@|\.\.|\,|\;!', $_address) ||
	        !preg_match('!^.+\@(\[?)[a-zA-Z0-9\.\-]+\.([a-zA-Z]{2,6}|[0-9]{1,3})(\]?)$!', $_address));
        
        if(!$_is_valid)
            return false;
    }
    return true;
}

?>