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Connected to but sender was rejected. Remote host said: 451 4.4.0 DNS temporary failure

Posted on 2007-11-14
Medium Priority
Last Modified: 2008-02-01

we are trying to email parkinson-swor.ca using the rogers.ca Mail Relay.

we are getting a bounced message:

"Connected to but sender was rejected.
Remote host said: 451 4.4.0 DNS temporary failure (chkuser) I'm not going to try again; this message has been in the queue too long."

The following is the tracert from my side;

C:\Documents and Settings\Administrator>tracert parkinson-swor.ca

Tracing route to parkinson-swor.ca []
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  isa2k4.parkinson.ca []
  2     6 ms     5 ms     7 ms
  3     7 ms     *        8 ms  vl-201.gw03.ym.phub.net.cable.rogers.com []
  4     8 ms    27 ms     7 ms  te-15-1-0.gw01.ym.phub.net.cable.rogers.com []
  5     6 ms     7 ms     7 ms  so-1-2-0.gw02.ym.phub.net.cable.rogers.com []
  6    48 ms    52 ms    47 ms  pos-3-0.igw01.chfdrl.phub.net.cable.rogers.com []
  7    48 ms    55 ms    47 ms  so-0-2-2.mpr1.ord2.us.above.net []
  8    48 ms    49 ms    68 ms  so-3-0-0.mpr2.ord7.us.above.net []
  9    50 ms    38 ms    37 ms []
 10    40 ms    37 ms    35 ms  chgr31-pos-bgr11.q9.net []
 11    37 ms    45 ms    35 ms  dist1-1.brm1-f2.q9.net []
 12    41 ms    40 ms    35 ms  dist1-1-g-acess1-2.brm1.q9.net []
 13    38 ms    35 ms    36 ms  6.98.46-69.static.nerdsonsite.com []
 14     *        *        *     Request timed out.
 15     *        *        *     Request timed out.
 16     *    

Would it be correct to say that their is a problem connecting to them after [] - i.e one of their internal servers / routing or a firewall or some rule is a problem?

Question by:melu
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LVL 31

Expert Comment

ID: 20283945
Try your own IP address here, and see if you're on any blacklists:

Author Comment

ID: 20284007
Seems fine. We are not blacklisted.

Also please see the results of the telnet:

C:\Documents and Settings\Administrator>telnet mx01.nerdsonsite.com 25

220 mailscan1-0.nerdsonsite.com ESMTP
mail from : <myName@domain.com>
451 4.4.0 DNS temporary failure (chkuser)
LVL 31

Expert Comment

ID: 20284273
My telnet from here returned OK .  Try a DNS Report test on your domain name here;
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Author Comment

ID: 20284402
Can you please see the report


For security reasons - I dont want to reveal the domain name [here].

LVL 31

Expert Comment

ID: 20284656
I would guess that the 'Mail server host name in greeting' warning is the most significant here.  Have a look at the properties of your Default SMTP Virtual Server, and enter the name 'mail1.parkinson.ca' as the Fully-Qualified Domain Name.

Author Comment

ID: 20285578

I have corrected the 'Mail server host name in greeting' warning.

I am still not able to resolve that error. Any idea what could be causing the problem?


LVL 31

Expert Comment

ID: 20285887
Well, that seemed the most obvious to me, but I guess it's time to work through the other failed items.  The error message
451 4.4.0 DNS temporary failure (chkuser)
does seem to suggest a DNS problem, and you had a lot more fails and warnings than I would have expected.  Trouble is, I don't know what most of them mean, and I think only your ISP (assuming they are your DNS provider) can fix them.

Author Comment

ID: 20286377
Interesting thought.

The ISP is rogers..ca - and the DNS provider is upscalehost

They are not the same.

But, we dont have any problems sending to anyone else apart from this one organisation
LVL 31

Accepted Solution

LeeDerbyshire earned 200 total points
ID: 20286403
Actually, it doesn't matter that they're not the same, but they often are.  I was suggesting that they might be your best point of contact for DNS issues.

This organization might do more DNS checking than most.  Some admins enforce rigorous domain DNS checking to combat spam.  The obvious risk is that they will lose some valid emails without even knowing about it.

Author Comment

ID: 20319828

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