While I agree with merlyn about html email (I delete html email unread before it reaches the mail client), and your question is not especially perlish, it sounds like:

• A laudably cautious mail client is converting external urls to local urls
• or possibly your 'action' in the form is incorrect, or incorrectly formatted

If this is for company internal use only (and I hope it is, otherwise you are likely to meet with an unsympathetic response), you could post the form that you are using, and what mail client is used in your company.

I'm not sure I understand how 'i'm able to make it work with a simple form that gets sent to a mailto: address - it simply brings up an email with the To, From and Subject filled in' relates to the rest of it though.