How to send an email to multiple recepient with contact form?
Here is a possible implementation to achieve what you're asking about:


define a new eMail ID, say x@sample.com.
configure this x@sample.com to automatically forward all incoming eMail to your "multiple eMail addresses".
in your form, use x@sample.comas the email ID where these forms should be eMailed to (which will then be forwarded after you completed the prior step).