Hi Ted! :-)
> I was wondering which module in Cyrus provides return receipt ? Return receipt is traditionally provided by the mail client (outlook, netscape, pine, eudora), not the mail server. Unlike return recepit from the post office, which is a service the transport agent provides the sender, it is a service the receipient may choose to provide the sender. The only systems I know that can be configured to provide "enforced" return receipt are corporate end-to-end solutions like Exchange.