Al, when it rains it pours. In addition to the almost-solved problems with the e-mail server, a couple of people told me yesterday that they were unable to get into the website.
I followed up with our webmaster this morning, and learned that the site had been moved from one host company to another. In the process, the IP address of the site got turned off. It was turned back on this morning, but takes 24 hours to regenerate because it has to run through some sort of overnight batch process.
Long story short (too late, I know!) the site should be up and running in the morning.