Well, the first thing I would say (don't hit me) is double-check that your cron task is set to run every day and that the command, including your Dailymail Password from ListMail, is correct.
Secondly, how do you know it's not running? Do you have followups or scheduled messages that aren't going out?
If not, make sure that "Send report to admin when dailymail runs" is turned on and that your Administrator Email is your main email account.
If you receive the dailymail report you will know it's running.
On some hosts your administrator will need to verify that the program /usr/bin/wget is available. If it's not, it could be in a different directory which would need to be reflected in your cron task. More rare, "user permissions" on the wget program might need to be updated by your host.