I hope you guys don't think I'm stupid to ask such a question...
But what is spam *exactly* ?
Ok, first this is how I see the mail transportation:
___________________________ __________________________
| HOST A | | HOST B |
| router |out---------+ | router |out
| | | | |
in| sender restrictions (2) | +---->in| sender restrictions (2) |
|___________________________| |___________________________|
/|\
|
| relay
| restrictions
| (1)
|
this is where
the message is born
(e.g. build by netscape)
(1) e.g. sender_host_accept_relay
(2) e.g. sender_net_accept
Ok, here it goes...
If the relay restriction are too lose, people could use HOST A to relay
mail. But what's the big deal about that?
Of course it's not very pleasant that other people use the mailer of HOST
A to send their mail - but the traffic for this people stays the same.
No matter if they relay it to their mailer or any other - doesn't it?
So why would they do that?
All I could think of would be to have a message with a large header with
many cc. So there is one message coming in and maybe 100 going out. So
you just have to relay one message and cause a traffic of 100!
Is that all spam-mail "works" like?
Is spam-mail always being relayed, or is it also coming over the "in"
port?
Where/when does it happen that a single message with 100 cc is spread into
100 messages?
thanx
Torsten
--
*** Exim information can be found at
http://www.exim.org/ ***
