With HCL Notes/Domino V12 the new feature “Enable Alternate From” in shared mail files was delivered. But be aware of the following issue:
if your Domino Server is running on Windows be sure to enter the file name with a backslash “\” and if your server is running on Linux use a slash “/”.
The “Open” button is working in both ways but if you try to enable the new feature from within the shared mail file you’ll receive the following error:
If you use the correct character you’re able to enable this feature and will see that you can force the usage of the Internet Address used for all mails sent from this shared mail file: