Brother ADS-2400N - Manual (Page 134)

Scan Using Your Computer
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 Settings tab (Scan to Image/OCR/ E-mail)
Choose the Target Application, File Type, Resolution, Scan Type, Document Size and 2-sided
Scanning settings.
NOTE
The Scan to E-mail feature does not support Webmail services. Use the Scan to Image or Scan to File
feature to scan a document or picture, and then attach the file of the scanned data to an email message.
If you choose Secure PDF (*.pdf) from the File Type list, the Set PDF Password dialog box appears.
Enter your password in the Password and Re-type Password box and then click OK.
NOTE
Secure PDF (*.pdf) is available for Scan to Image, Scan to E-mail and Scan to File.