It can use Outlook, Outlook Express, Eudora, etc. Once created the mail account is due to form the account of mail of the following form:
Name of user: firstname.lastname@example.org (the user will be the email account that previously created from its Control Panel)
Servant MGP: sudominio.com
Servant smtp: sudominio.com
Port MGP: 110
Port smtp: 26
If he got to have problems when forming his client of mail sends a support ticket to receive help in this task.