> >(7) When a message is sent to two or more lists on the same server, > >users subscribed to more than one of the lists should receive only one > >copy of the message. > > I'm not sure that this is desirable. For one thing, it isn't consistent: > the results would depend on whether the lists are on the same server or > not. The subscriber could have a filter to log the mail in various > folders based on which list it comes from, and in that case one of the > two folders would be selected randomly to receive the message, and it > wouldn't be in the others. Again, while this saves disk space, it isn't > very consistent. It isn't even consistent with news where, while there is > only one copy of the message, it will be shown in both newsgroups. With a > mail interface this will not be the case. I'm subscribed to a lot more lists on our own server than any other and there is a fair amount of cross posting, so it would help quite a bit in a common case here. With regard to the filtering, the headers should mention both lists. Wouldn't that take care of it?