Preferences Screen General Options
The Encryption for Email Preferences window contains five tabs. By default, it opens on the General Options tab. On this tab, you can select the email address that is always able to read private messages. There might be many email addresses on your computer if different users access their email from this computer.
Note: All of the options in the tabs can be configured separately for each email address. If you have more than one registered email address, select and configure each address separately.
Open the Encryption for Email Preferences screen as explained in Accessing the Preferences Screen.
Click the General Options tab.
From the Select an address to configure drop-down list, select the email address to use as the default.
Click Set as default.
Click Apply or OK to save the setting.