This is what I did for my customer who wanted to use only email with no attachments via dial-up.
1. I started with a Knoppix 3.3 Live CD and an old Dell Dimension PC. I installed an Intel 536EP PCI dial-up modem card.
2. In Knoppix, I ran the script to install Knoppix to the hard disk. I chose KDE as the desktop environment.
3. Running Knoppix from hard disk, I downloaded, compiled and installed the Intel536-4.68 kernel driver.
4. Set up KPPP to access the dial-up Internet Service Provider.
5. Set up KMail to access the ISP's POP3 mail server and SMTP outgoing mail server.
6. Checked that the Konqueror web browser/file manager was able to access basic websites.
7. Installed an Epson C62 printer in the CUPS printer manager, which is accessed with Konqueror, using the URL http://localhost:631/
8. In CUPS printer manager, for the Epson C62 I chose Set Printer Options and Color Model: Greyscale.
An alternative to the Intel 536EP PCI card is a standard 56k serial modem, nice to have lights to look at while it is working. This lasted for 7 years with no problems, until replaced because the customer decided to do something else.