Canon imagePROGRAF GP-4000 - Manual (Page 925)

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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 receiving mail server (POP3 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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