If you are trying to process your phpList queue using a crontab, you will have to set up the phplist script provided in the bin directory to work with your system. It looks like this:
#!/bin/bash# script to run PHPlist from commandline. You may need to edit this to make it work
# with your shell environment. The following should work for Bash# in commandline mode, access is restricted to users who are listed in the config file
# check README.commandline for more info# identify the config file for your installation
CONFIG=/home/website/public_html/lists/config/config.php
export CONFIG# alternatively you can use -c on the commandline# run the PHPlist index file with all parameters passed to this script
/usr/bin/php /home/website/public_html/lists/admin/index.php $*
Of course you will want to modify all the paths to fit your phpList install. Most importantly, however, is to not forget to modify the FIRST line if need be. Otherwise, if your bash interpreter exists elsewhere, when your try to execute your script you will get the following error:
/path/to/phplist: Command not found.
For the majority of the installations out there, /bin/bash should be fine, however on some systems you may need to edit this to point to where your bash interpreter is installed. In my case, I had to change it to /usr/local/bin/bash.

To future-proof my changes, I also symlinked to where my bash existed:
ln -s /usr/local/bin/bash /bin/bash
That way I will not have to re-edit new versions of the phplist script in future phpList upgrades.