We have installed a zimbra server with 3 domains. The mails are fetched from ISP with fetchmail and distributed to the accounts.

Everything works fine - Mails for the domains installed are trasfered local others are trasmitted by the smtp from the ISP.

Now I hava a problem with one mailaccount where the mails should stay at the ISP and read from an external address. (Our the Zimbraserver is only local accessable). As I don't fetch the mails there are no problems with external mails, but if I send an mail to this account from an internal account Zimbra tries to deliver the mail local and the mail will never reach the ISP.

Is there a possibility to route mails for this account or this domain external, so that the mails will end up on the mailaccount by our ISP?