On Feb 28, 19:49, Jay West wrote:
> My ISP runs two SMTP mail servers, one open, the other not;
Open relays have NOTHING to do with the above
situation - talk about
throwing the baby out with the bathwater - the above scenario is akin to
saying "gee, I want to allow http through my firewall, so lets just open
firewall up for all ports and all services to and from
Well, maybe, which is why the European ISPs (and mine in particular) are
looking for another method. As more and more sites use MAPS or other
services, the need for a better solution becomes greater.
There are two other much more "standard"
methods of allowing the above.
First, the user could still check his email at his original/local
via pop or imap,
they do that anyway -- *receiving* mail isn't part of the problem.
and he could send mail from the smtp server at his
But it would have the "wrong" address, and lots of people can't seem to
cope with that.
Second, any time an ISP sets up an agreement
with another ISP to let their users roam, they could just add the roaming
ISP's domain name to their sendmail.cw file to allow relaying from that
Agreed, but we're talking about hundreds of ISPs, not just a few. And for
reasons I've never really understood, quite a number of European ISPs,
including one of the biggest UK providers, don't provide DNS PTR records
for their dialups (so authentication is more difficult).
I'm not personally advocating the use of open relays, BTW. The servers I
help manage are not open, because we were hit a long time ago. I'm merely
pointing out an instance where a bunch of ISPs have seen them as an interim
solution -- and issue warnings to roaming users that some of their mail may
bounce because recipient servers may block them.
Pete Peter Turnbull
Dept. of Computer Science
University of York