MX records. No record for remote.ourdomain.org.uk

Hi,

I have an issue with one server rejecting our emails but I think I should have an additional MX record.

Using MX toolbox. When I search cmp.org.uk I get

10      remote.cmp.org.uk      81.137.89.197      60 min      Blacklist Check      SMTP Test

When I search remote.cmp.org.uk I get no record exists.

My question is should I have records setup for remote.cmp.org.uk and is so what records do I need.

Thanks.
dlogan83Asked:
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Randy PooleCommented:
What is the email address suffix ex(@domain.com) that the emails are coming from?
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dlogan83Author Commented:
cmp.org.uk

The reason I am asking because I ran a test using Wormly and go the following error.

Resolving hostname...
Connecting...
SMTP -> FROM SERVER:
220 remote.cmp.org.uk Microsoft ESMTP MAIL Service ready at Wed, 13 Aug 2014 12:09:19 +0100
SMTP -> FROM SERVER:
250-remote.cmp.org.uk Hello [184.72.226.23]
250-SIZE 31457280
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH
250-8BITMIME
250-BINARYMIME
250 CHUNKING
MAIL FROM: irene@cmp.org.uk
SMTP -> FROM SERVER:
250 2.1.0 Sender OK
RCPT TO: cas@curtisfurniture.co.uk
SMTP -> FROM SERVER:
SMTP -> ERROR: RCPT not accepted from server:
Message sending failed.
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Randy PooleCommented:
Well you are trying to send an email to your exchange server to another domain (curtisfurniture.co.uk) and since I don't see you have authenticated the sending user (irene) it should reject it unless you had an open relay..
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Randy PooleCommented:
also you may want to set your server up to answer as cmp.org.uk instead of remote.cmp.org.uk
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dlogan83Author Commented:
OK is there a way to resolve this. We only have issued with this one server.
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Randy PooleCommented:
Elaborate on (this)
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dlogan83Author Commented:
We send emails to other clients / servers from our existing exchange set-up using remote.cmp.org.uk and emails from @cmp.org.uk. We only seems to have issued sending to this one server @curtisfurniture.co.uk
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Randy PooleCommented:
Gotcha,  do you get a NDR or do the emails not go through at all?
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dlogan83Author Commented:
Hi, no that's the problem we don't get a DNR. Emails are recorded as going out ok. Thats why I used wormly to try figure our whats happening.
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Simon Butler (Sembee)ConsultantCommented:
The test you did at Mx Toolbox was correct.
You don't need MX records for remote.cmp.org.uk. The MX records are part of the root domain (cmp.org.uk), of which remote is just a host.

You even have a PTR record in place, so there is no problem there.

Was your test to your own server? If so, it looks like you did things the wrong way round, which is why it has failed (as expected). If you are testing your own server then you put in a local address as the To, not the From, basically the failure is the anti-relaying test.

You need the NDR that is being returned when sending email to the remote host.

Simon.
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Mohammed TahirMicrosoft Exchange and O365 AdministratorCommented:
Hi dlogan83,

Your email domain is @cmp.org.uk and you are trying to send email to external domain @curtisfurniture.co.uk Right ?

First I want to clear that (remote.cmp.org.uk     81.137.89.197) is MX record of your email domain @cmp.org.uk and while SENDING email your MX record not comes in picture. You will route through smarthost or DNS which you can confirm on send connector.

Another question, domain in question is only rejecting mails from your domain or any domain. Did you tested with another domains like @gmail.com or @yahoo.com?


Tahir
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dlogan83Author Commented:
Hi. I tested from my server remote.cmp.org.uk (@cmp.org.uk) to curtisfurniture.co.uk we can email from Gmail to curtisfurniture.co.uk no problem.

I sent another test to Curtis today and still no NDR back.
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Simon Butler (Sembee)ConsultantCommented:
Are the messages in the queue? If you only sent the message today but they are rejecting them in a temporary manner, then the messages will have to timeout (48 hours by default).

Simon.
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dlogan83Author Commented:
Hi Simon,

I has been happening for a few months now.
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Simon Butler (Sembee)ConsultantCommented:
That wasn't what I meant.

You said

"I sent another test to Curtis today and still no NDR back. "

If the remote server is rejecting the email in such a way that doesn't generate an immediate NDR, then you would see them in the queue. You would only get an NDR when the message times out.

Almost certainly the problem is with the remote server, they must be using something else to do spam filtering than Exchange because it isn't sending back an immediately NDR.
You may end up having to use a smart host for email to that domain - your ISPs SMTP server will do the job.

Simon.
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dlogan83Author Commented:
Thanks for the help guys.
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