[BlueOnyx:27186] outlook 2016 and Domain Names

[Jeff Scott]

I'm sure this has been answered, but I can't find it. Since I normally don't use blueonyx for email, this hasn't been an issue. But I have a user with Win10 and Outlook 2016, and it seems to require the IMAP login to be the full email address, but authentication only works with just the username on 5211R . Is there a server side setting I can change to allow IMAP logins using fully qualified email addresses? 
Thanks, 
Jeff 
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