Re: ipw2100 wireless driver

David Woodhouse
2004-08-11T23:27:47Z

On Thu, 2004-08-12 at 01:11 +0200, Tomas Szepe wrote:
> On Aug-12 2004, Thu, 00:06 +0100
> David Woodhouse <postmaster@infradead.org> wrote:
>
> > On Thu, 2004-08-12 at 00:56 +0200, Tomas Szepe wrote:
> > > Ok, thanks for the warning. Is there any reason why you should
> > > be trying to look up postmaster@ from the sender domain upon
> > > RCPT TO?
> >
> > Part of standard verification of sender addresses. You're being offered
> > an email.... if you can't send a bounce to the address it claims to come
> > from, or if you can't send a mail to postmaster at the same domain, then
> > the chances that the mail you're being offered is a fake are high enough
> > to warrant rejecting it.
>
> Ok, I see, but wouldn't an "and" where you write "or" make more sense? :)

Don't think so. I reject the mail _either_ if I can't send a bounce to
the user it claims to come from, _or_ if I can't send mail to the
postmaster at that domain. Either failure is sufficient to cause a
rejection.

I don't accept mail from an invalid user just because I can contact
postmaster, and I don't accept any mail from a domain for which I can't
contact postmaster (except for mail addressed to postmaster@ one of my
domains, which is more permissive in order to assist debugging/reporting
problems).

> Anyway, I screwed up in the aliases vs. virtusertable department again.

I saw it was fixed, and I wiped my callout cache so you should be able
to send mail to users @infradead.org other than postmaster again.

--
dwmw2