If you have not found instructions for setting up the email client use hint for your selected program.
The settings you will need the following information.
POP3
Server Address: pop3.best-hosting.cz
port 110
Name identical with the e-mail address. eg neco@pokus.com
Password that you set
IMAP
Server Address: imap.best-hosting.cz
port 143
Name identical with the e-mail address. eg neco@pokus.com
Password that you set
SMTP
Server Address: smtp server of your internet provider
Phone
+420 491 618 519 Technical support
+420 491 618 517 Orders, invoicing
Email
podpora@best-hosting.cz Technical support
ucetni@best-hosting.cz Billing department