Yes, i know there are threads about this.
My IT can't seem to figure out how to get the server to accept the email to the alias -- what gives? anyone experience this?
Your IT should know why it's bouncing -- they have the SMTP logs. Particularly for an out-of-band bounce, which means the message was received by more than one of your company's servers.
Without more details on the bounce message there's no way we could help.