On Friday 06 June 2003 07:28, David wrote: > --- Ole Wolf <[EMAIL PROTECTED]> wrote: > > As Cory Wright mentioned, most of the Yahoo spam doesn't come from a > > Yahoo > > server. Doesn't this indicate that if the problem is to be dealt with > > on the > > MTA level, part of the problem might not really be Yahoo and Excite? > A lot of free webmail addresses don't originate at the same server because folks use the throw-away addresses, but send them from their own ISP
> I remember seeing this mentioned several times on the qmail list. There > was some discussion there about a patch that someone created that would > compare the sender's domain name against the actual domain name of the > mail server from where the mail was sent... and was able to do a > reverse lookup of the mail server's IP Address to confirm this. At > least that's the way I remember it. Either way, that's something that > should be done at the MTA. People use their yahoo address, but send from their ISP's smtp server. For those domains that are used with bogus addresses, the latest postfix snapshot has a verify_sender feature which can block them. I am clueless as to whether qmail or sendmail or exim have anything similar. > > What Jason is suggesting is different, because a whitelist cannot be > checked as easily at the MTA level. So the MTA has to accept the mail > and then TMDA can reject it if it's not in the whitelist. > Now, I am either missing something here, or simply misunderstand. All of our business clients and the people we want to insure receiving mail from are whitelisted at the MTA level. Since our freemail restrictions are so, well, restrictive (we block 4800 free email domains), the only way someone can send to us from any of them is if they are whitelisted at the MTA level. > This is an interesting topic and I'll be following this thread to see > other comments. I'd be interested in seeing what becomes of this. > -- Sed quis custodiet ipsos custodes? ========================================================================== Robin Lynn Frank - Director of Operations - Paradigm-Omega, LLC Copyright and PGP/GPG info in mail or message headers. Email acceptance policy at http://paradigm-omega.com/email_policy.html ========================================================================== _____________________________________________ tmda-users mailing list ([EMAIL PROTECTED]) http://tmda.net/lists/listinfo/tmda-users
