uddeIM uses the address of the recipient in the REPLY-TO line.
The reason is quite easy. Before this mechanism was used some people answered to the message and the reply was sent to the admin which address is used as sender in notification emails. Using the recipient address protects the email address of the sender, confidential messages are not send by mistake to the admin.
uddeIM & uddePF Development
CB Language Workgroup
CB 3rd Party Developer