On Tue, Dec 07, 1999 at 11:59:19PM +0100,
Stefaan A Eeckels <[EMAIL PROTECTED]> wrote:
>
> I've got a colleague who claims that many ISPs (he lives in
> Canada, so probably Canadian ISPs) refuse mail based on the
> MAIL FROM: command. To me, that seems inane and futile, but
> as I'm not an ISP, and don't work for one either, I'm
> solliciting the views of people in the know.
I think the theory is that (by rejecting mail with unresolvable names)
spammers will be forced to use real domains and the domains belonging
to spammers can be blocked, and spammers that use other people's domains
can get sued.
While there have been some successful suits, using domains belonging to
others is still popular.
Another problem is that some places have started blocking messages with
empty envelope sender addresses, because some spammers use them to get
past the domain blocking.
