Can I use mailing programs (POP3)?

You can use mail programs such as:

Outlook Express
Outlook
Eudora
Мozilla Thunderbird

etc.

The addresses of the "Incoming server" and "Outgoing server" are specified in the letter sent to you upon activation of hosting.

DO NOT FORGET! to select the setting "My SMTP server requires authentication" to be able to send mail.
For details, see pages settings of various email clients.