I have this problem sending out to only certain people. I can send messages to my webmail (not zimbra) or GMAIL, and recieve it. When I send messages to my ISP account, I never receive it there. It stays in the deferred queue on zimbra.

Any ideas on why this message never goes out of the server?

Sometimes I get a messages from other mail servers that blocked my message, because the IP (localhost) that zimbra attaches to the message is included in their spam lists.

Any ideas on how to remove this IP from being attached to the email?

Thanks in advance!!!