Conditional Autoresponder based on drop down

I’m trying to have an autoresponse on form submit sent based on the selection in a drop down menu. If I have two job titles in the drop down, each has been set up to deliver a different set of questions based on the selection. I’d like to be able to send an autoresponse to Job Title 1 if selected, or a different one if Job Title 2 is selected. I’ve tried the following code to create an autoresponse based on a drop down menu:

#hook in to wpcf7_mail_sent - this will happen after form is submitted
add_action( 'wpcf7_mail_sent', 'contact_form_autoresponders' ); 

#our autoresponders function
function contact_form_autoresponders( $contact_form ) {

        if( $contact_form->id==1 ){ #your contact form ID - you can find this in contact form 7 settings

            #retrieve the details of the form/post
            $submission = WPCF7_Submission::get_instance();
            $posted_data = $submission->get_posted_data();                          

            #set autoresponders based on dropdown choice            
            switch( $posted_data['position'] ){ #your dropdown menu field name
                case 'Media Buyer':
                $msg="This is an auto response for Media Buyer";
                break;

                case 'Agency':
                $msg="This is an auto response for Agency";
                break;

                case 'Business Owner':
                $msg="This is an auto response for Business Owner";
                break;

            }

            #mail it to them
            mail( $posted_data['YourEmail'], 'Thanks for your enquiry', $msg );
        }

}

I’ve tried with and without the Mail 2 option selected, but I don’t see any auto response. Am I doing this right? I followed this suggestion