Larry Sheldon wrote: > On 2/20/2010 11:53 AM, valdis.kletni...@vt.edu wrote: > >> So we've looked at it from 2 different aspects, and in both cases, the >> RFC says you shouldn't be bouncing spam to where it came from. > > Small nit, which is germane to the whole discussion; "...the RFC says > you shouldn't be bouncing spam to where IT SAYS it came from." > > There is no way in the current universe to know where the item came from > by inspecting it. You can only tell where you got it from...and if you > can't reject it while you know that, you must discard it.
s/mime detached signatures rooted in some ca that you trust are actually a rather good way of identifying the sender. it's path or orign mail server is rather irrelevant in that context. i's not a general purpose solution but your statement is false.
