Enable shared mail files to send mail using an internet address by default

There is now an option for mail-in databases to send mail using an internet address by default.

To enable this feature, select File > Preferences > Mail > Access & Delegation > Access to Your Mail & Calendar and check Enable Alternate From Feature and Automatically use internet address of Mail-in database as sender under "For Mail-in-Database Only".

For more information, see Selecting an alternate From address in a shared mail file