Brother MFC-9420CN - Manual (Page 61)

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In the Settings tab
You can select Target Application, File Type, Resolution,
Scan Type, Document Size, Brightness and Contrast
settings.
Scan to E-mail:
In the General tab
You can enter up to a 30 character name in the Name for
Custom field. This name will appear as the button name.
Select the type of scan from the Scan Action field.
In the Settings tab
You can select E-mail Application, File Type, Resolution,
Scan Type, Document Size, Brightness and Contrast
settings.