You can use the Parallels Plesk Panel control panel to set up an email account for a domain name on your Virtual Private Server (VPS).
Once you have created your email account, you can further customize the settings from within Parallels Plesk Panel, or you can connect to your account using an email client.
Your POP3 and SMTP setting for this email account is mail.example.com, where example.com is your domain name. Your incoming user name for the account is firstname.lastname@example.org. The outgoing (SMTP) server requires authentication and uses the same user name and password as the incoming (POP3) server.
For more information about setting up email accounts in Parallels Plesk Panel, you can take a look at the Plesk documentation on Parallels' website.