Simply put. Spammers use dialups to send their email. As ISP's or end users
we are not required to accept spam and thus have the right to block all mail
origining from those addresses. Most dialup ISP's require that users send
email through their SMTP systems. This keeps you in compliance with their AUP
as well as ensuring that your email is not hitting an RBL. For postfix it
would be something like
"relay=whateverytheirsmtpserveris.yourispserver.whatevertheirextentionis".
BTW, RFC's are guidelines for the community but surely not laws. So, if
someone says nothing from that IP address will come through there server then
they have that right.
Right now every web site that I host has a webmaster, postmaster and an abuse
account. I have always received spam in the webmaster account. Most of the
spams are for web site posistioning, email marketing and web hosting. Now, we
block them but then we say that it's okay to send to postmaster. Do you think
that they wouldn't spam that account as well?
Gary Smith
-----Original Message-----
From: Dennis Davis [mailto:[EMAIL PROTECTED]
Sent: Thu 2/5/2004 10:15 AM
To: Shane Williams
Cc: [EMAIL PROTECTED]
Subject: Re: Lost of FPs because of IPs listed in DUL + "open Proxy"
No. See "4.5.1 Minimum Implementation" of RFC2821 which says:
SMTP systems are expected to make every reasonable effort to accept
mail directed to Postmaster from any other system on the Internet.
In extreme cases --such as to contain a denial of service attack or
other breach of security-- an SMTP server may block mail directed to
Postmaster. However, such arrangements SHOULD be narrowly tailored
so as to avoid blocking messages which are not part of such attacks.
I certainly take the above to imply the postmaster address is
exempt from RBL blocking etc. About the only thing we won't do is
accept viruses send to postmaster.
