Folks, I realize that this is something that could happen. Interesting attack! But I missed the part where its somehow news to us that e-mail system can be tricked in various ways. And: Most of the time in important discussions it does not matter if some messages get lost. People have lengthy debates about matters, and only some of the participants are blocking specific receivers. You talk to your colleagues and friends about the discussions. You go and check archives now and then for various reasons. In short, we typically rely on multiple sources and media for our information, which helps detect problems if there are any. And there are already a number of reasons why you could be missing information, such as false positives in your e-mail client's spam processing. (Personally, I like to receive duplicates because then I know the emails have gone to the list.) --Jari _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf