Canon MB5100 Series Online Manual page 1074

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Cause
Cause of following may have occurred failure of sending mail.
• File size of scanned data is too large.
• Printer's memory is full.
What to Do
Tap OK on the touch screen of the printer.
Take the corresponding actions below.
• Lower the resolution and retry to scanning.
• Reduce the documents and retry to scanning.
If the error is not resolved, take the corresponding actions below.
• Check the maximum attachment file size for sending the scanned data.
You can set the maximum attachment file size with Remote UI.
Specifying Mail Setting for Sending Scanned Data
• Check your mail server condition.
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