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Hi Dennis -
On Fri, 13 May 2011 13:25:52 -0400, Dennis <iseries@xxxxxxxxxxxx>
wrote:
If they are like many others who use this technique, they simply want to know that (both) :
the IP address can be resolved to a host
that host is not generic name like those assigned by ISPs for dialup and the like.
Let's not forget also that after
the IP address can be resolved to a host
comes
the host name resolves back to that same IP address. (It can also
legitimately resolve to additional IP addresses.)
Personally I don't implement any of these requirements on my personal
mail server. There are too many clueless ISPs and too many clueless
admins.
For example, a hosting company, which is multi-homed and controls
their own DNS and rDNS, sent me an email where the rDNS host name did
not resolve to the IP address. (It wasn't spam. It was a billing
notification for my sister's domain which is hosted there but which I
pay for.)
Ken
Opinions expressed are my own and do not necessarily represent the views
of my employer or anyone in their right mind.
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