The E-mail Client You Want to Use Does Not Appear in Scan Utility's Selection Screen
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Check Check that the e-mail client's MAPI is enabled.
Refer to the e-mail client's manual for how to set MAPI.
If the problem is not solved even when MAPI is enabled, select None (Attach Manually) in the screen for selecting an e-mail client, then manually attach the image to the outgoing e-mail.