Canon Pixma MG6821 Online Manual page 925

The E-mail Client You Want to Use Does Not Appear in the Screen
for Selecting an E-mail Client
Check that the e-mail client's MAPI is enabled.
Check
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.
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