Re: smail (again..... sheesh..)
On Mon, 9 Mar 1998, Soenke Lange wrote:
: > No, I'm just telling them that the mail originated in my isp's domain.
: > The HELO supposedly tells them who I am.
: >
: Yes! ... HELO/EHLO your.domain.org
: then smail (with some switches on) will test if the name and the IP# of the
: originating host correspond, else smail will not accept mail from this
: host. Other MTA will differ .. but with this method most spams will not find
: the way to you...
: Still there are lots of misconfigured Mail server, but if more and more
: people using smail or some other strong spam protection, they will convert
: there configs (imho).
Well, OK, you might call them misconfigured. But read this quote from
rfc1985: "[...] there is no documented stipulation for checking the
authenticity of the remote host name, as given in the HELO or EHLO command."
I cannot find any pointers in more or less official documents stateing that
HELO/EHLO *should* be followed by the same argument as the reverse
DNS-lookup tells. Do you agree?
So why should Smail block any mail coming from mailhosts not correctly
announcing their hostname in the smtp-greeting ? Certainly, a lot of spam
could be blocked this way, but on the other hand, lots of 'legal' mail get
lost too :(
bye,
Remco
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