In order to download your mail you will have to configure an email client such as Microsoft Outlook or Mozilla Thunderbird.
The following are the settings you should use:
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Secure SSL/TLS Settings
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Username: user@yourdomain.com
Password: Use the email account’s password.
Incoming Server: yourdomain.com
IMAP Port: 993
POP3 Port: 995
Outgoing Server: yourdomain.com
SMTP Port: 465
Authentication is required for IMAP, POP3, and SMTP.
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Webmail
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You can view your mail online by going to:
http://yourdomain.com/webmail
Username: user@yourdomain.com
Password: Use the email account’s password.