aliases being re-written

[eleith]

given: alias1@domain.com is an alias for user1@domain.com

when someone sends an email to alias1@domain.com, user1@domain.com will receive the email in their inbox, and the 'to:' field will show that the email is alias1@domain.com. (the expected / desired behavior)

however sharing and chatting do not preserve this behavior, for example:

user2 shares something with alias1@domain.com, but when looking at the shared account user2 now sees that it is shared with user1@domain.com instead (the alias was rewritten by zimbra somewhere down the line)

the same thing happens with chatting. if user2 adds alias@domain.com, eventually user1@domain.com will show up in the buddy list instead of alias@domain.com

am i missing an option somewhere to turn off this forceful rewriting of aliases, or can this be considered a bug that is worth considering?