Eudora 4.0

Eudora Email Settings

Open Eudora

Click on Tools

Click on Options

Select Getting Started on the left

Verify the Reply Address, Incoming Mail Server and Login Name

Select Sending on the left

Verify the SMTP

Click on OK

The rest of the options are pretty inconsequential. Here is a run down on them in needed:
Check Mail: Has options to Save Password and Check for mail more frequently
Sending Mail: Word wrap
Replying
Attachments
Fonts
Display
Viewing Mail
Mailboxes
Stylized Text
Spell Checking
Date Display
Labels
Getting Attention
Extra Warnings
Advanced Network
MAPI
Auto Configure
Automation
Kerberos
Miscellaneous