Login with Cron Job

I have a bit of an odd situation. I am setting up a private blog which only allows registered members in. However, I most also setup an email post system. This requires that a cron job be setup to run the wp-mail.php to check the pop3 account.

Well as you can guess, the cron job can’t get in, if WP requires a password.

Is there a way to have my cron job enter the user name and password and then run the wp-mail.php file?

Here is my current cron job, standard stuff:

wget -N https://www.vanguard.artfulalibi.com/wp-mail.php