On Mon, Sep 17, 2001 at 04:40:06PM +0100, Alan Thew wrote:
> The following type of thing happens all the time
> Received: from 209-187-167-231.hsacorp.net ([209.187.167.231]
> helo=hotmail.com)
> I would like to compare the actual rDNS data with the HELO info in the
> specific case of hotmail.
RFC1123:
| 5.2.5 HELO Command: RFC-821 Section 3.5
|
| The sender-SMTP MUST ensure that the <domain> parameter in a
| HELO command is a valid principal host domain name for the
| client host. As a result, the receiver-SMTP will not have to
| perform MX resolution on this name in order to validate the
| HELO parameter.
|
| The HELO receiver MAY verify that the HELO parameter really
| corresponds to the IP address of the sender. However, the
| receiver MUST NOT refuse to accept a message, even if the
| sender's HELO command fails verification.
MBM
--
Matthew Byng-Maddick <mbm@???> http://colondot.net/
