P&T Contact Form plugin : how can I dynamically add multiple email recipients inside the form config file? I don't want to show up the email recipients in the source code using this :

&lt;input type="hidden" name="toEmail" value="{{ 'me@example.com,me2@example.com'|hash }}"&gt;


I want to manage multiple emails dynamically from the contactform.php config file in my craft/config folder. 

&lt;?php

return array(
    'toEmail' =&gt; (hash('firstemail@domain.com, secondemail@domain.com') ?: null),
);


This config file is not working and don't override the plugin settings in the CP. What would be the best way to achieve this ?

[UPDATE]

I ended to this, but while it is working fine in the front end, this is causing PHP errors in the CP :

&lt;?php

return array(
    'toEmail'  =&gt; array(
        ('firstemail@domain.com' ?: null),
        ('secondemail@domain.com' ?: null)
     )
);
This is how to achieve this :

&lt;?php

return array(
    'toEmail' =&gt; ('firstemail@domain.com,secondemail@domain.com' ?: null),
);