Kamil Jońca wrote: > How can I achieve this? > I looks like I have write custom acl, but it is not obvious to me how to > write proper condition in such acl. hi, where is the recipient? why would you want to receive for "Undisclosed-Recipient". I suggest you look deeper and see where it is coming from. In the end you may drop or reject this mail as it does not go anywhere. To me it looks like something is broken regards