Hi guys, follwoing code will send mail to multiple recievers as intended
            $SendObject = Yii::$app->mailer->compose()->setFrom($string)
                                ->setTo(array('goetz.bewerber@gmx.net','schulze.bewerber@gmail.com','susanne.bewerber@web.de'))
                                ->setHtmlBody($model->bodytext)
                                ->setSubject($model->betreff)
                                ->setTextBody($model->bodytext);
                        $SendObject->send();
Unfortunately, I will get Exception if I try like this:
$ZieladresseTest = "'goetz.bewerber@gmx.net','schulze.bewerber@gmail.com','susanne.bewerber@web.de'";
           	$SendObject = Yii::$app->mailer->compose()->setFrom($string)
                                ->setTo(array($ZieladresseTest))
                                ->setHtmlBody($model->bodytext)
                                ->setSubject($model->betreff)
                                ->setTextBody($model->bodytext);
                        $SendObject->send();
Exception:
Address in mailbox given ['goetz.bewerber@gmx.net','schulze.bewerber@gmail.com','susanne.bewerber@web.de'] 
does not comply with RFC 2822, 3.6.2.
Any ideas,
[list=1][]why exception will be thrown out[]how to avoid Exception using variables for setTo() ?[/list]