Re: [exim] Exim server behind NAT router (and HELO)

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Autor: Fred Viles
Data:  
Para: Exim User's Mailing List
Asunto: Re: [exim] Exim server behind NAT router (and HELO)
On 21 Mar 2005 at 2:17, Greg A. Woods wrote about
    "Re: [exim] Exim server behind NAT r":


|...
| Regardless RFC 1123 is also still the main part of the mandatory host
| requirements standard (part of STD 3), the single most important (though
| as I said, somewhat dated and politically flawed) requirements document
| for all Internet participants.  It still reads, in part:
| 
|       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.  [[ .... ]]


And goes on to say:

         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.


Look familiar?

- Fred