Re: [Exim] Require A records for host names in HELOs?

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Auteur: The predudiciously configured Exim User's Mailing List
Date:  
À: Fred Viles
CC: exim
Sujet: Re: [Exim] Require A records for host names in HELOs?
[ On Wednesday, February 4, 2004 at 23:12:02 (-0800), Fred Viles wrote: ]
> Subject: Re: [Exim] Require A records for host names in HELOs?
>
> Interesting, even RFC2821 contradicts itself on this point.


It could do nothing but -- it must defer to RFC 1123. :-)

> I find no mention of PTR
> records in RFC2821.


Why would you expect to? They're not pertinent to SMTP directly --
they're simply used in the DNS to validate hostnames. Hostnames are
used in SMTP (particularly in the greeting command and it's response).

You must learn to look at the _whole_ picture. No one rule in the RFCs
stands alone.

--
                        Greg A. Woods


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