Hi sh_tech.
Please scan and attach a document to an email using the Canon IJ Scan Utility program on the computer. Please send the email to the address that you are experiencing the issue with. Do you receive any errors?
If there are no errors when sending the document this way, please call us at 1-800-OK-CANON (652-2666), Monday - Friday 10:00 a.m. to 6:30 p.m. ET (excluding holidays).