I've got users that are "managers" of some shared folders on a couple of generic email addresses. Some of the emails that come into those shared folders are forwarded to other departments. However, since installing the 5.0.18 ZCO, those "manager" users cannot forward any of the messages out of those shared folders. We get an immediate bounceback message saying:
Error: This message could not be sent.
Subject: subject of email
To: address trying to forward to
Note: You are not allowed to send on behalf of this person. Please recreate and resend the message.
Any ideas? It all works fine if you're logged into the webmail and send it that way. The issue only appears on machines with the 5.0.18 ZCO.