Bell Canada/Bellnexxia ignoring MX records, anybody else?

Discussion:

(too old to reply)

Mark Jeftovic

2008-04-17 15:50:43 UTC

We've been working on this for about a week, we are in touch with some
network folks at Bell but I'd like to see if this is something a bit
more widespread than domains hosted on our nameservers. (We have had a
report of similar behavior from another DNS host)

At any rate, what it looks like to us is that customers using Bell SMB
outbound mail servers, possibly other outbound mail servers on Bell
(Nexxia, Sympatico?) to destination domains whose NS are hosted on our
nameservers seem to have the MX record *ignored* and the mail is
delivered to the A record for the domain.

We also suspect that it happens when the MX record points at a host back
inside the Bell network/address space.

Is anybody else noticing this?

-mark

--
Mark Jeftovic <***@easydns.com>
Founder / President, easyDNS Technologies Inc.
Company Website: http://www.easyDNS.com
I ramble pointlessly from my blog: http://www.PrivateWorld.com

Mike Tancsa

2008-04-17 16:17:31 UTC

Permalink

Post by Mark Jeftovic
At any rate, what it looks like to us is that customers using Bell
SMB outbound mail servers, possibly other outbound mail servers on
Bell (Nexxia, Sympatico?) to destination domains whose NS are hosted
on our nameservers seem to have the MX record *ignored* and the mail
is delivered to the A record for the domain.
We also suspect that it happens when the MX record points at a host
back inside the Bell network/address space.

I had a quick look on our web server for the last 7 days (where the A
record for sentex.net resides), and the only hosts contacting us
there trying to send from @sympatico email are from Hotmail IP space
(Bell I think outsources their resi email to MSN/Hotmail). What IP
addresses are involved in your case ? Send them to me and I can take
a look to see if they are showing up. If you need more detail (SMTP
IDs etc) let me know and I can send that offlist.

---Mike

# zgrep -i sympati maillog.[0-7].gz | grep relay= | awk -F"relay=" '{print $2}'
bay0-omc1-s26.bay0.hotmail.com [65.54.246.98]
bay0-omc2-s2.bay0.hotmail.com [65.54.246.138]
bay0-omc2-s23.bay0.hotmail.com [65.54.246.159]
bay0-omc1-s36.bay0.hotmail.com [65.54.246.108]
bay0-omc1-s6.bay0.hotmail.com [65.54.246.78]
bay0-omc1-s18.bay0.hotmail.com [65.54.246.90]
bay0-omc1-s22.bay0.hotmail.com [65.54.246.94]
bay0-omc1-s8.bay0.hotmail.com [65.54.246.80]
bay0-omc2-s40.bay0.hotmail.com [65.54.246.176]
bay0-omc2-s17.bay0.hotmail.com [65.54.246.153]
bay0-omc1-s8.bay0.hotmail.com [65.54.246.80]
bay0-omc3-s6.bay0.hotmail.com [65.54.246.206]
bay0-omc3-s16.bay0.hotmail.com [65.54.246.216]
bay0-omc1-s7.bay0.hotmail.com [65.54.246.79]
bay0-omc3-s1.bay0.hotmail.com [65.54.246.201]
bay0-omc1-s4.bay0.hotmail.com [65.54.246.76]
bay0-omc2-s13.bay0.hotmail.com [65.54.246.149]
bay0-omc1-s41.bay0.hotmail.com [65.54.246.113]
bay0-omc2-s39.bay0.hotmail.com [65.54.246.175]
bay0-omc3-s25.bay0.hotmail.com [65.54.246.225]
bay0-omc1-s15.bay0.hotmail.com [65.54.246.87]
bay0-omc2-s19.bay0.hotmail.com [65.54.246.155]
bay0-omc2-s14.bay0.hotmail.com [65.54.246.150]
bay0-omc2-s5.bay0.hotmail.com [65.54.246.141]
bay0-omc2-s38.bay0.hotmail.com [65.54.246.174]
bay0-omc3-s19.bay0.hotmail.com [65.54.246.219]
bay0-omc2-s9.bay0.hotmail.com [65.54.246.145]
bay0-omc1-s32.bay0.hotmail.com [65.54.246.104]
bay0-omc3-s12.bay0.hotmail.com [65.54.246.212]
bay0-omc2-s36.bay0.hotmail.com [65.54.246.172]
bay0-omc2-s40.bay0.hotmail.com [65.54.246.176]
bay0-omc1-s3.bay0.hotmail.com [65.54.246.75]
bay0-omc3-s31.bay0.hotmail.com [65.54.246.231]
bay0-omc3-s6.bay0.hotmail.com [65.54.246.206]
bay0-omc1-s29.bay0.hotmail.com [65.54.246.101]
bay0-omc2-s9.bay0.hotmail.com [65.54.246.145]
bay0-omc1-s34.bay0.hotmail.com [65.54.246.106]
bay0-omc3-s35.bay0.hotmail.com [65.54.246.235]
bay0-omc1-s21.bay0.hotmail.com [65.54.246.93]
bay0-omc1-s7.bay0.hotmail.com [65.54.246.79]
bay0-omc2-s7.bay0.hotmail.com [65.54.246.143]
bay0-omc1-s39.bay0.hotmail.com [65.54.246.111]
bay0-omc3-s38.bay0.hotmail.com [65.54.246.238]
bay0-omc3-s23.bay0.hotmail.com [65.54.246.223]
bay0-omc2-s1.bay0.hotmail.com [65.54.246.137]
bay0-omc2-s18.bay0.hotmail.com [65.54.246.154]
bay0-omc2-s38.bay0.hotmail.com [65.54.246.174]
bay0-omc1-s20.bay0.hotmail.com [65.54.246.92]
bay0-omc1-s11.bay0.hotmail.com [65.54.246.83]
bay0-omc3-s1.bay0.hotmail.com [65.54.246.201]
bay0-omc3-s21.bay0.hotmail.com [65.54.246.221]
bay0-omc2-s6.bay0.hotmail.com [65.54.246.142]
bay0-omc1-s13.bay0.hotmail.com [65.54.246.85]
bay0-omc2-s1.bay0.hotmail.com [65.54.246.137]
bay0-omc1-s25.bay0.hotmail.com [65.54.246.97]
bay0-omc2-s36.bay0.hotmail.com [65.54.246.172]
bay0-omc3-s7.bay0.hotmail.com [65.54.246.207]
bay0-omc3-s20.bay0.hotmail.com [65.54.246.220]
bay0-omc1-s35.bay0.hotmail.com [65.54.246.107]
bay0-omc2-s16.bay0.hotmail.com [65.54.246.152]
bay0-omc3-s40.bay0.hotmail.com [65.54.246.240]
bay0-omc3-s13.bay0.hotmail.com [65.54.246.213]
bay0-omc2-s6.bay0.hotmail.com [65.54.246.142]
s1.bay2.hotmail.com [65.54.246.99] (may be forged)
bay0-omc2-s5.bay0.hotmail.com [65.54.246.141]
bay0-omc1-s14.bay0.hotmail.com [65.54.246.86]
bay0-omc3-s22.bay0.hotmail.com [65.54.246.222]
bay0-omc1-s13.bay0.hotmail.com [65.54.246.85]
bay0-omc1-s17.bay0.hotmail.com [65.54.246.89]
bay0-omc2-s10.bay0.hotmail.com [65.54.246.146]
bay0-omc3-s3.bay0.hotmail.com [65.54.246.203]
bay0-omc3-s11.bay0.hotmail.com [65.54.246.211]
bay0-omc2-s26.bay0.hotmail.com [65.54.246.162]
bay0-omc3-s33.bay0.hotmail.com [65.54.246.233]
bay0-omc1-s40.bay0.hotmail.com [65.54.246.112]
bay0-omc1-s39.bay0.hotmail.com [65.54.246.111]
bay0-omc3-s15.bay0.hotmail.com [65.54.246.215]
bay0-omc2-s19.bay0.hotmail.com [65.54.246.155]
bay0-omc3-s38.bay0.hotmail.com [65.54.246.238]
bay0-omc2-s37.bay0.hotmail.com [65.54.246.173]
bay0-omc3-s24.bay0.hotmail.com [65.54.246.224]
bay0-omc1-s32.bay0.hotmail.com [65.54.246.104]
bay0-omc2-s33.bay0.hotmail.com [65.54.246.169]
bay0-omc1-s24.bay0.hotmail.com [65.54.246.96]
bay0-omc1-s2.bay0.hotmail.com [65.54.246.74]
bay0-omc2-s25.bay0.hotmail.com [65.54.246.161]
bay0-omc3-s35.bay0.hotmail.com [65.54.246.235]
bay0-omc2-s30.bay0.hotmail.com [65.54.246.166]
bay0-omc1-s6.bay0.hotmail.com [65.54.246.78]
bay0-omc3-s18.bay0.hotmail.com [65.54.246.218]
s1.bay2.hotmail.com [65.54.246.99] (may be forged)
bay0-omc2-s24.bay0.hotmail.com [65.54.246.160]
bay0-omc3-s16.bay0.hotmail.com [65.54.246.216]
bay0-omc2-s39.bay0.hotmail.com [65.54.246.175]
bay0-omc2-s1.bay0.hotmail.com [65.54.246.137]
bay0-omc2-s40.bay0.hotmail.com [65.54.246.176]
bay0-omc1-s17.bay0.hotmail.com [65.54.246.89]
bay0-omc3-s3.bay0.hotmail.com [65.54.246.203]
bay0-omc1-s30.bay0.hotmail.com [65.54.246.102]
bay0-omc3-s3.bay0.hotmail.com [65.54.246.203]
bay0-omc3-s9.bay0.hotmail.com [65.54.246.209]
bay0-omc2-s40.bay0.hotmail.com [65.54.246.176]
bay0-omc3-s36.bay0.hotmail.com [65.54.246.236]
bay0-omc2-s18.bay0.hotmail.com [65.54.246.154]
bay0-omc2-s29.bay0.hotmail.com [65.54.246.165]
bay0-omc2-s2.bay0.hotmail.com [65.54.246.138]
bay0-omc2-s16.bay0.hotmail.com [65.54.246.152]
bay0-omc1-s33.bay0.hotmail.com [65.54.246.105]
bay0-omc3-s19.bay0.hotmail.com [65.54.246.219]
bay0-omc2-s31.bay0.hotmail.com [65.54.246.167]
bay0-omc3-s23.bay0.hotmail.com [65.54.246.223]
bay0-omc2-s8.bay0.hotmail.com [65.54.246.144]
bay0-omc2-s1.bay0.hotmail.com [65.54.246.137]
bay0-omc3-s19.bay0.hotmail.com [65.54.246.219]
bay0-omc3-s39.bay0.hotmail.com [65.54.246.239]
bay0-omc3-s32.bay0.hotmail.com [65.54.246.232]
bay0-omc3-s33.bay0.hotmail.com [65.54.246.233]
bay0-omc1-s20.bay0.hotmail.com [65.54.246.92]

Raymond L. Corbin

2008-04-17 20:28:41 UTC

Permalink

I brought that up to Hotmail back in November/December where their servers kept trying to deliver to the A record of a domain instead of the MX...after about three correspondences with their 'postmaster support' varying from them saying to check the spelling and try again or to contact the recipients ISP...they came back with

" After carefully investigating your account, I have verified that there was a technical problem that caused this issue. However, I am glad to inform you that this has been resolved and you should now be able to send messages properly."

Perhaps more 'technical problems'?

-Ray

-----Original Message-----
From: owner-***@merit.edu [mailto:owner-***@merit.edu] On Behalf Of Mike Tancsa
Sent: Thursday, April 17, 2008 12:18 PM
To: Mark Jeftovic
Cc: ***@nanog.org
Subject: Re: Bell Canada/Bellnexxia ignoring MX records, anybody else?