Your incoming and outgoing server is mail.yourdomain.com where yourdomain.com is the name of your domain. You can use that for all your mail servers: POP3, IMAP and SMTP. More information on how to do that is available in your Welcome email.
Bear in mind that these mail servers are only valid if your domain name is pointed to your ScalaHosting hosting account. Additional configuration may be required if you’re hosting your domain with another provider.