----- Original Message -----
From: "Alex van den Bogaerdt" <alex(_at_)ergens(_dot_)op(_dot_)het(_dot_)net>
To: <spf-discuss(_at_)v2(_dot_)listbox(_dot_)com>
Sent: Tuesday, February 22, 2005 5:35 AM
Subject: Re: [spf-discuss] Email Forwarder's Protocol ( EFP )
On Tue, Feb 22, 2005 at 03:07:36AM -0700, David MacQuigg wrote:
>Unless the IP gets an SPF PASS, the only way to do that is to issue an
>SMTP
>REJECT.
If the IP address is recorded in a header, then a bounce could be sent
even
*after* the SMTP session is closed. Seems to me that an ability to relay
a
delayed bounce may be an unavoidable requirement if forwarders are going
to
participate in an IP-authenticated transfer.
Why should a sending host also be a receiving host ?
It need not be, but it's quite common. It's the big mail servers that
separate this to two machines or sets of machines.