Brother MFC-640CW - Manual (Page 144)

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Scan to E-mail
10
„ General tab
Enter a name in Name for Custom (up to 30 characters) to create the button name.
Choose the type of scan from the Scan Action field.
„ Settings tab
Choose the E-mail Application, File Type, Resolution, Scan Type, Document Size, Show Scanner
Interface, Brightness and Contrast settings.