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I'm taking a look in Zimbra configuration with multiple servers (Open Source Edition). I made a installation of two server (load1 and load2) following the wiki page.
Now, when I create a mailbox account on "@load1" the mailbox is created on "load2" as mail server. In fact I can only create mailboxes on load2.
Bugzilla
Wiki
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Multiple servers, one mail server? 
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