On the 'General' Tab ensure your e-mail address is in the forma me@mydomain.com
On the 'Receiving (POP3)' tab
'POP3 Host' line enter mail.mydomain.com
'User Name' line enter your FULL e-mail address e.g. me@mydomain.com (NOTE: Pegasus may give an warning message IGNORE this error message). Enter your password for new account.
On the 'Sending (SMTP)' tab enter smtp.mydomain.com