We switched over to Zimbra this summer and are using the web interface exclusively. In our pre-Zimbra days we posted to a couple of tech listservs using Outlook or T-Bird clients, no problem.

Now when we try and post to the same listservs, our messages do not get posted. The messages are delivered (mail.log looks normal) but rejected by the listserv server. If we fire up an Outlook client and shoot the same message, it gets posted.

On the back end of the listserv, they are using ListServ 14.5 from Lsoft.

Has anyone else run into this type of problem? Any ideas on what's happening on the Zimbra end? We'd like to be able to post without having to fire up Outlook.