If you wish to change the hostname to your incoming and outgoing email server and you use Outlook express email client, follow the instructions below:
1. Open Outlook Express and click to "Tools" and "Accounts"
2.Choose your account and click to "Properties”"
3. In the incoming and Outgoing email, delete the records and enter the temporary hostname eg. linux77.papaki.gr
The hostname can be found in the email "Web Hosting Activation - Account Login Information", in the fields "FTP Access Information" and "Temporary Hostname", as shown in the following picture: