Re: Does IP have DNS or not?

On Wed, 7 Jul 2004, Jim Wright wrote:

> This came in a few days ago, and so I contacted the postmaster there=20
> regarding his system having a problem:
>=20
> Jul=A0 1 21:19:02 localhost postfix/smtpd[509]: connect from=20
> unknown[63.82.232.8]
> Jul=A0 1 21:19:04 localhost postfix/smtpd[509]: NOQUEUE: reject: RCPT=20
> from unknown[63.82.232.8]: 550 Client host rejected: cannot find your =20
> hostname, [63.82.232.8]; from=3D<***@hometel.com>=20
> to=3D<***wrightthisway.com> proto=3DSMTP helo=3D<mail.hometel.com>
> Jul=A0 1 21:19:04 localhost postfix/smtpd[509]: disconnect from
> unknown[63.82.232.8]
>=20
> He has responded back saying his info resolves fine, claiming the issue=
=20
> is on my end. I tried resolving that IP both on my home system and=20
> work system (different ISP/DNS servers), and both came back as:
>=20
> ** server can't find 8.232.82.63.in-addr.arpa: NXDOMAIN
>=20
> However, in between those two I went to remote.12dt.com/rns/ to do a=20
> reverse lookup on that address, and it responded with ns2.hometel.com=20
> for that IP.
>=20
> So, I'm assuming that he still has some DNS issues on his end, but I=20
> don't know enough about such things to tell him what the problem is. =20
> Or is there really a problem on my end somehow?

Hmm when I try to resolve your IP i get:
8.232.82.63.in-addr.arpa domain name pointer ns2.hometel.com.
So it seems to resolve fine.
A more general remark would be that there seem to be quite a couple of=20
machines with an IP that doesnt have a hostname and which serve as MTA.
In my case blocking all connections from IP's that don't resolve would=20
result in not being able to receive certain mails I wish to receive,=20
eventhough I think that such cases the dns isnt configured decently on=20
their side.
Bye,

Mipam.