Users working on sites that have many different Servers (erver1.myorg.org, server2.myorg.org, server3.myorg.org) tend to use addresses with non-qualified domain names (user@server1, user@server2, user@server3). When you have only few servers in your myorg.org "upper level" domain, you can "fix" those addresses by specifying several Router Table records:
If you have many servers in your myorg.org "upper level" domain, it becomes impossible to provide Router Table records for all of them. In this case you may want to enable the Add myorg.org to Non-Qualified Domain Names option. If thisoption is enabled, and an address cannot be routed using CommuniGate Pro Router Table and Modules, and the domain part of the address does not contain a dot symbol, the specified string (myorg.org) is added to the address domain name (separated with the dot symbol). The address user@someserver will be converted to the firstname.lastname@example.org address and the Router will try to route this new, corrected address.
Note: It is a very bad practice to use non-qualified domain names in E-mail or Signal addresses. Enable this option only if you can not enforce a policy that requires your users to specify correct, fully-qualified domain names in all addresses they use.