On Wed, Jun 09, 2010 at 02:49:51PM -0400,
 Arcady Genkin <agen...@gmail.com> wrote 
 a message of 13 lines which said:

> Zonecheck issues a warning if a reverse query on a name server's IP
> address does not match the advertised host name.

Do note that SMTP servers (MTA) are much more severe, many refuse to
talk to a client without a successful PTR->A check.
> Would anyone please explain the reason for this warning?

RFC 1912, section 2.1. Note that the default is just a warning since
the proper PTR does not depend only on the name server administrator
but also on his access provider / operator.

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