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From: prj@po.cwru.edu (Paul Jarc)
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Subject: Re: Sender header?
Date: 24 May 2001 17:26:31 -0400
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Stainless Steel Rat <ratinox@peorth.gweep.net> writes:
> * Graham Murray <graham@barnowl.demon.co.uk>  on Thu, 24 May 2001
>| 1) Dial-up hosts using dynamic IP. In this situation, the user is often
>|    given a mailbox of user@isp.com. [snip]
> 
> There must be an A record (and FQDN) for the IP address.  A properly
> configured dialup server will provide the FQDN associated with the IP
> address, and a properly configured dialup host will set its name to that
> FQDN for the duration of its connection.  Gnus generates Sender
> fields using that FQDN (or it should).

But I though you wanted Sender to have the user's canonical address.
In this case, the user's cacnonical address very clearly does not
include the system's current FQDN.

> The MX record associated with the A record will make it a
> deliverable mailbox.

You don't seem to understand DNS.  The dialup's name has an A record,
and may (but need not) have an MX record.  The A record certainly does
not have an MX record associated with it.

>| 2) Hosts on an internal LAN (probably using RFC 1918 addresses) behind a
>|    firewall. [snip]
> 
> Internally those fields should be as canonical as possible.  It is the
> responsiblity of the mail gateway to properly masqerade header fields.

Where does RFC 2822 make that requirement?


paul