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DNS (Domain Name Servers). DNS translates the "text name" of a host/server (which humans use) we are trying to reach, to the IP address of that host (example: from www.google.com to 18.104.22.168).
In your network there are DNS server entries (primary and backups), and domain name suffixes; defined usually at a Gateway device to keep things simple.
Some ISPs (i.e. Shaw, Rogers) make the presumption that most users connect directly to their modem (without a router). They set their modem's DHCP server to supply a default domain name suffix and provide the user with a shortform prefix for their mail servers such as "shawmail" or "rogersmail" to use in the email client popmail settings (Outlook, ThunderBird...).
When you are connected directly to their Modem, it is set to translate the prefix to the appropriate mail server's IP address. However, when your LAN (computer) is connected through a router (or the DVG ATA), although the router (or DVG) gets the domain name suffix from the modem, it may not pass this onto the LAN (your computer); hence, it cannot resolve this prefix correctly.
You should be able to resolve this with either of the following:
• Use the full mailserver name (if you want your LAN to have its own domain name - the three cases below do not allow this)
•Get the fully resolvable text name of the mail server from your ISP (i.e. "shawmail" becomes "shawmail.gv.shawcable.net", etc).
• Use this name within the popmail settings of your email client.
•Set the DVG's (or router's) domain name suffix
•Login to the DVG ATA
•Expand (Left Click) DHCP Configuration
•Left Click on Dynamic IP Assignment
•Modify the Domain Name to the value you're supposed to have
•Left Click on Save and follow the instructions
•Set your computer's DNS settings (example for Windows XP)
•Go into Network Connections
•Right click on Network Adapter and left click properties
•Find Internet Protocol (TCP/IP) and select it (left click)
•Left click on properties
•Left Click on the Advanced button
•Left Click on the DNS tab
•Modify the "DNS Suffix for this connection" text to the value you're supposed to have
•Left Click on OK
•Set your computer's Search Domain settings (example for Mac OS X)
•Go into System Preferences-->Network
•Select the Network Port Configuration that you use for internet access
•Click Configure (at the bottom of the window)
•Click the TCP/IP tab
•Place your cursor in the 'Search Domains' field
•Enter the DNS suffix for your ISP (e.g. gv.shawcable.net)
•Click on 'Apply Now'