For email client (Outlook, Mail, Foxmail, etc). You may use the default settings:
Incoming server: imap.yourdomain.com port: 993 (with SSL connection) or 143 (without SSL connection).
Outgoing server: smtp.yourdomain.com port: 25, 26 or 587 (without SSL connection).
To allow MAC users to send email – Additionally, enable advanced SMTP options and input user email address and password.
For further instructions please download the USER MANUAL: https://www.internetsolutions.hk/dashboard/dl.php?type=d&id=5