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Is the printer on a wireless connection? or wired network? or perhaps directly connected to the computer with a USB cable?
Are you printing email from Internet Explorer, or from MS Outlook, or from some other application? if something else, which one, please?
Is there an error message when the disconnection occurs? if so, what is the full and exact text of the error message, please?
With this information I may be able to help you with the problem. Thanks.