I have tried setting up the cron job to process the mailing scheduled job using both the php cli method and the URL with wget.
In the first case, I can get the cli.php to run from the command line and the mail queue is processed but when I try to run the same job from cron, it fails with an invalid username and/or password error. The username and password are exactly as specified when run from the command line (copied and pasted).
With the URL method, I cannot get the job to process the queue either from the command line or from the cron job. The mail remains in the queue.
The cron jobs are being set up in the CPanel.