Fix and Modify a feedback form

We have a customer with a PHP feedback form on their site which isn't working correctly. After an e-mail address is entered on the form, it's being saved correctly to the database and is viewable from within their admin panel, but the e-mail they receive displays it as an odd combination of characters (i.e. mailto:"[[login to view URL]??????????) I need that issue corrected as well as two minor additions: 1 - Add a field to capture a telephone number (and display it in both the admin and e-mail) 2 - Add a CAPTCHA to the form. The site is configured using a custom CMS, but I don't anticipate any problems for a competant PHP coder.