[155126] in North American Network Operators' Group
Re: Is Hotmail in the habit of ignoring MX records?
daemon@ATHENA.MIT.EDU (Michael J Wise)
Thu Jul 26 22:29:27 2012
From: Michael J Wise <mjwise@kapu.net>
In-Reply-To: <20120727013411.A55B12311FA5@drugs.dv.isc.org>
Date: Thu, 26 Jul 2012 19:28:47 -0700
To: Mark Andrews <marka@isc.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Jul 26, 2012, at 6:34 PM, Mark Andrews wrote:
> In message <A9A5C64B-831D-42BF-8A38-56CC3B9BAF48@kapu.net>, Michael J =
Wise writ
> es:
>>=20
>> On Jul 26, 2012, at 1:35 AM, Lou Katz wrote:
>>=20
>>> The domain is cookephoto.com
>>=20
>> Why does mail.metron.com have MX records?
>=20
> Why do you care? There is nothing wrong with having explict MX
> records and they generally take up less room in a DNS cache then
> the negative response does especially if it is DNSSEC signed.
>=20
>> And they're different.
>=20
> Again why do you care?
Why do *I* care?
I don't.
I'm just trying to find the weird bit that maybe is causing hotmail to =
stumble.
And maybe an endless loop for an MX lookup might be what is causing =
hotmail to panic and throw out the MX records.
>> $ host cookephoto.com
>> cookephoto.com has address 192.160.193.89
>> cookephoto.com mail is handled by 10 mail.metron.com.
>> cookephoto.com mail is handled by 12 mail2.metron.com.
>> cookephoto.com mail is handled by 15 mail.katz.com.
>>=20
>> $ host mail.metron.com
>> mail.metron.com has address 192.160.193.14
>> mail.metron.com mail is handled by 10 mail.metron.com.
>> mail.metron.com mail is handled by 20 mail.katz.com.
>>=20
>> $ host mail.katz.com
>> mail.katz.com has address 192.160.193.14
>>=20
>> $ host mail2.metron.com
>> mail2.metron.com has address 209.204.189.91
>>=20
>> $ host plaid.metron.com
>> plaid.metron.com has address 192.160.193.135
>>=20
>> Normally, in my experience, the actual mail server doesn't have MX=20
>> records as such, but=3D85.
>> Just seems 0dd.
>=20
> All address record (A and AAAAA) have MX records. Some may be
> implicit but as far as SMTP is concerned they all have MX records.
>=20
>> Also, you say =3D85
>>=20
>>> At the time of the transaction, nothing special was happening here,=20=
>> ...
>>=20
>> Was anything strange happening with any of the DNS records for any of=20=
>> these domains in the past two days?
>>=20
>> Aloha,
>> Michael.
>> --=20
>> "Please have your Internet License =20
>> and Usenet Registration handy..."
> --=20
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742 INTERNET: marka@isc.org
Aloha,
Michael.
--=20
"Please have your Internet License =20
and Usenet Registration handy..."
