Eudora
Step 1
In Eudora select ‘Tools’ from the menu bar followed by "Options".

Step 2.
Referencing the screeen shot below, enter your details as follows
* Real Name: Enter your name as you wish it to appear when sending emails to people
* Mail Server (Incoming): Enter your mail server name. This is pop. yourdomainname.com
* Login Name: Enter the username for your email account
* SMTP server (Outgoing): Enter your mail server name. This is smtp.yourdomainname.com
* Allow Authentication: Please make sure this option is selected.

Finally, Click "OK", to save your settings.