Hmm.. Mysteriously I am altering my info like you said, and when checking the account with "ga" I get this:
Still when sending mail to myself through the server it is still forwarded to the old slave server.
[zimbra@ms1 log]$ zmprov ga firstname.lastname@example.org | grep MailTransport
Me being a relative newbie with this I am not quite sure where to check more detailed logs than just the nice queue display in the webinterface. Thus I am having a bit of difficulty troubleshooting this.