Homey, the issue I was having was not any technical problem with phpList, but my own unfamiliarity with how it worked. With time, I probably could have figured it out. Just didn't have the time, so dropped US$60 on MailMachinePRO, which is a bit more user-friendly and included installation and tech support (although it takes 5+ days to get responses from them). Happy to report that it's up and running. Love it.