Setting up Eudora Light 3.0.x
Open Eudora Light and click on TOOLS and then OPTIONS.
If necessary, drag the left side upward to see "Getting Started", and single click it.
Make sure the information is like the above "Getting Started" Options picture. The "POP" account" is your Email address WITH the word mail inserted after the @ sign. (This is typical of Eudora Light, but not the "Pro" version).
Once done, click on Personal Info.
Make sure the information is like the above "Personal Info" Options picture.
Once done, click on Hosts.
Make sure the information is like the above "Hosts" Options picture.
Once done, click OK.