ISPs
When you install WorkgroupMail, the installation program automatically creates an ISP which you will see in the WorkgroupMail administrator when you first start it. If one
or more users in your organization collects mail from a POP3 account hosted by a different ISP, then the details of this ISP must be entered into the WorkgroupMail adminsitrator.
More:
Adding a New ISP
Setting up the Users