I'm not full sure if I understand your question but to output a link to send email to a specific address use the following:
print "<a href=mailto:user@domain.com>Email me</a>";
To include a link within an (text) email that was send from a PHP script, I find that simply including the url will create a link in most email readers, ie, Outlook, Hotmail etc. Best to include the http:?? bit.
Kevin
