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I have a free yahoo email account that is my main email account.
I also have an email account associated with a Yahoo hosted website. When I set them up in Zimbra, I created a separate account for each, using the email address for each.
IN zimbra, the email is merged from both accounts, all the file folders, all the emails... on BOTH Zimbra locations...
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Source
Multiple Yahoo Emails with ONE user id problem 
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