Re: A Quickhack

"Gordon Fecyk - Home" <[email protected]> wrote:
> This is one of those time I think it's better to practice civil
> disobedience.

  Let's try an example.

  mail.example.com == 1.2.3.4
  ftp.example.com  == 1.2.3.5
  *.3.2.1._asrg_rmx_.example.com = "permitted to send smtp"

  A recipient MTA receives a request from 1.2.3.4, but the EHLO says
"ftp.example.com".  The reverse MX record says that that IP is
permitted to send SMTP, but the host name doesn't match the IP.

  Would the message be accepted or discarded?  Why?


  My inclination is to say that the message should be accepted.  The
domain owner has published an explicit statement of consent, via the
reverse MX record.  The recipient MTA may decide implicitly that
something is wrong with "ftp.example.com" coming from 1.2.3.4, but I
don't see why the message would be rejected.

  Alan DeKok.