Hi
No, there is no need to symlink. Pear is a "packaging system" on it's own, so you need to "pear install" stuff after you have installed the pear package with aptitude.
Code:
sudo pear install mail
This downloads the mail stuff in /usr/share/php. And PHP has its own include_path which is similar to $PATH in the shell. It looks in many directories when you include/require files. By default, the include_path is ".:/usr/share/php:/usr/share/pear", so this should work:
PHP Code:
require "Mail.php";