Spamhaus...

Sun Feb 21 00:10:54 UTC 2010

Larry Sheldon wrote:
> On 2/20/2010 11:53 AM, Valdis.Kletnieks at 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.