Automatic emailing with links

As you will see from the link, I have created a php form for the customer to click checkboxes for the information they want to receive, and supply their details including email address.
On submitting, the action is to go to a perlscript file that creates an email that includes links to the requested files and automatically send them to the email address supplied by the customer. It also creates an email to the client telling them of the request. I am using this system on five websites I manage for clients.
I am being told frequently that the perlscript is now old fashioned and possibly insecure. Is there anything on the market that could perform the same function, ie a WordPress plugin. All my searching finds are ‘amazing and powerful’ plugins, but not one that performs the above tasks.
Any advice would be gratefully received. Thanks
Andrew King

The page I need help with: [log in to see the link]