You can do this, just be sure to change the localconfig variables which utilize this mailbox:
Originally Posted by batfastad
One reason NOT to do this is the risk that your account will get locked out from hackers trying to login with one of the aliases like "postmaster".
zimbra@viognier:~> zmlocalconfig | grep 'admin@'
av_notify_user = firstname.lastname@example.org
smtp_destination = email@example.com
smtp_source = firstname.lastname@example.org
We consume an extra license to have an extremely obscurely named mailbox hold all those "postmaster", "webmaster", "abuse" aliases. Several years ago our Admin account got locked out for precisely this reason (we require very complex passwords, have a strict lockout policy and rely on auditswatch for notifications of potential mailbox hack attempts).
IOW, the extra license is very cheap insurance.
Hope that helps,