Brother DCP-8155DN - Manual (Page 202)

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 Settings tab
Choose the E-mail Application, File Type, Resolution, Scan Type, Document Size,
Manual multi-page scan, Duplex (two-sided) Scanning (For DCP-8155DN, MFC-8910DW and
MFC-8950DW(T)), Show Scanner Interface, Brightness and Contrast settings.
Note
Webmail services are not supported by Scan to E-mail.