purpose of PTR record ?
Joseph S D Yao
jsdy at center.osis.gov
Thu Dec 4 00:15:10 UTC 2003
On Wed, Dec 03, 2003 at 10:14:32AM +1100, Mark_Andrews at isc.org wrote:
...
> > The RFC for mail servers requires a reverse record.
>
> I suggest that you actually quote it if you can find it:-)
>
> There is *no* RFC that mandates that a PTR record MUST exist
> for anything or if they exist that the HELO/EHLO MUST match.
RFC 2821, the current SMTP RFC, actually describes a case where
"... no reverse mapping record is available", thus seemingly
legitimizing anonymous mail servers. The particular case was a mail
server that had received a random DHCP-style IP address with no reverse
DNS name. In this case, however, it has to use the literal IP address,
e.g., "[198.182.196.60]" or IPv6 version of same, to respond to HELO or
EHLO.
--
Joe Yao jsdy at center.osis.gov - Joseph S. D. Yao
OSIS Center Systems Support EMT-B
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