[[!FormIt?
     &hooks=`email,redirect`
     &redirectTo=`19`
     &redirectParams=`{"success":"1"}`
     &emailTpl=`feedbackEmailTpl`
     &emailSubject=`New request from [[++site_name]]`
     &emailTo=`***@gmail.com`
     &emailToName=`Support`
     &emailReplyTo=`***@gmail.com`
     &emailFrom=`***@gmail.com`
     &emailFromName=`***@gmail.com`
     &errTpl=`<span class="label label-warning">[[+error]]</span>`
     &validate=`
         name:required:stripTags,
         clientemail:email:required,
         message:required:stripTags
     `
     &clearFieldsOnSuccess=`1`
     &validationErrorMessage=`Error.`
]]

[2015-06-02 10:33:37] (ERROR @ /var/www/site/core/model/modx/mail/phpmailer/class.phpmailer.php : 893) PHP warning: preg_match(): Compilation failed: internal error: previously-checked referenced subpattern not found at offset 728
[2015-06-02 10:33:37] (ERROR @ /var/www/site/core/model/modx/mail/phpmailer/class.phpmailer.php : 893) PHP warning: preg_match(): Compilation failed: internal error: previously-checked referenced subpattern not found at offset 728
[2015-06-02 10:33:37] (ERROR @ /index.php) [FormIt] Произошла ошибка при попытке отправить почту. Пожалуйста, введите хотя бы один адрес e-mail получателя.

class myMailer extends PHPMailer
{
    public static function validateAddress($address, $patternselect = 'php')
    {
        return parent::validateAddress($address, $patternselect);
    }
}