Symptoms
When creating or editing the Smarthost settings in WorkgroupMail you are prompted to enter a primary and secondary Domain Name Server (DNS) address.
Detail
You must enter the addresses of two internet DNS servers. When sending a message directly to an internet recipient, one of these servers will be used by WorkgroupMail to resolve the domain name of the recipient’s address into the IP address of the destination mail server. The secondary DNS server is used when the primary DNS server is busy or unavailable.
The default entries suggested in the combobox are those associated with the TCP/IP network protocol of the interfaces on this computer. Alternatively, your ISP can usually provide you with details of their DNS server addresses.