Brother DCP-8040 User Manual page 172

Scan to E-mail
The Scan To E-mail is automatically configured to your default E-mail
application. To change the default E-mail application or attachment
file type, right-click on the E-mail button and select "Configuration".
The Scan Action tab is set to E-mail and should not be changed.
To change the E-mail application click on the Configuration tab. From
the Application pull down list, select your preferred E-mail
application.
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