Brand new to phplist and I also have the same issue on version 3.2.4. I also verified my settings and I have been searching for a while to try to figure out where I may have missed something. Nothing blank on my settings page and i don’t see anything missing in the config.php. Based on the processqueue.php I assume the getConfig(‘website’) is not finding the appropriate value
you might want to change the setting to something value like ‘123456’, and see where that 123456 show up in the emails … once you know where the system puts that value, you’ll have a better way to figure out your settings, and what the value should be.