Hello Paul,
the way you are referring to is the most commonly used. The users usually find the GUI more practical. To change the settings you can move the Gateway HDB file to a GUI Client, update the settings and move the HDB file to the slave Gateway back. This is not elegant, but faster.
In order to achieve your purpose you should follow step by step this instruction:
If the Gateway machine does not have a graphical interface and/or is not accessible (e.g. it is in a different building), you should work on a normal client machine to create the Gateway database, which you will then copy to the Gateway machine when the configuration work is complete. Remove the existing database (named "HANSA.HDB") from the folder containing the Standard ERP client application, and then launch the application. Because there is now no database in the folder containing the application, a new database will be created.
You can file the extended guide on how to set a Gateway and a mail system up on the hansamanual.com site:
http://hansamanuals.com/main/mailnumber___60009/theconf___85/manuals/version___82/english/hwconvindex.htm?shortcode=HW0602SETTINGUP_External_Mail
Best Regard
Giuseppe L.
HansaWorld Team