Canon imagePROGRAF PRO-6600 Online Manual page 814

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Cause
Communication with mail server failed.
What to Do
Tap OK on the touch screen to dismiss the error.
Check that the address and port numbers of the sending mail server (SMTP server) are correct in the
Remote UI mail server settings.
Setting Mail Server
If this does not resolve the error, check the status of the mail server.
Contact the mail server administrator to check the server settings and status.
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