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 -- E-mail the word "unsubscribe" to [EMAIL PROTECTED] TO UNSUBSCRIBE FROM THIS MAILING LIST. Trouble? E-mail to [EMAIL PROTECTED] .
