Setting Eudora 3.0x
Click "Tools", then "Options...".

Click "Getting Started".
For "SMTP Server (Outgoing)", please key in (without quotes) "smtp.mydomain-name.com". For example, if your domain name is "signetique.com", you will key in "smtp.signetique.com".
Check the box "Allow Authentication".

Click "OK".

When you send out an email, you will be prompted for a password. Please key in the password that you use for checking your mails. (You will only be asked for your password once. After that, Eudora will remember the password until you close the Eudora program.)