If you are not able to receive emails in Eudora please follow these steps:

1. Make sure your Eudora has been configured following these similar steps for Thunderbird:

http://www.siteground.com/tutorials/email/mozilla_thunderbird.htm

2. Make sure you are not having problems connecting to the POP3 / IMAP server:

http://kb.siteground.com/article/pop3_imap_refusing_connection.html

3. Make sure you have not exceeded your mail quota. Log in Cpanel and go to Mail, Manage email accounts. Increase the quota twice to make sure this is not the problem;

4. Make sure your MX records are correct. The easiest way to fix similar problems is by using Siteground's DNS servers:

http://kb.siteground.com/article/What_are_my_DNS_Records.html