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hodgson

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Hi all,

Using kerio version 7.2.3 build 4971
We are sending to a number of external e-mails all on 123reg.co.uk domains and we always get this message:

mx1.123-reg.co.uk: Cannot connect to remote host

I have spoke to 123reg and they say there is nothing wrong with their systems, however when I use DNSstuff to query the domain I get failures on the reverse dns (see attached image).

This happens when we send from any of our multiple sites, all using kerio. Nothing has changed recently and we can send to every other external domain, just not 123reg. Is this a problem our end or is it 123reg?

Thanks



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clan

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Have you tried to telnet to mx1.123-reg.co.uk on port 25 from your server running Kerio?
If this works you should enable mail in the debug log, maybe that gives some more hints on what is wrong.
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Lisa Lyons (Kerio)

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Also, what DNS servers are you using on your servers?

Kerio Technical Support
Log Support Incidents here: http://www.kerio.com/support
Also, please use our KB: http://kb.kerio.com
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hodgson

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Telnet works ok, our dns i provided by opendns. I tried sending again and this was the result:

mail log:
[12/Jul/2013 11:35:09] Recv: Queue-ID: 51dfdbdd-00000220, Service: WebDAV, From: <myemailaddress>, To: <destinationemailaddress>, Size: 6025, Sender-Host: <myip>, User: myemailaddress, SSL: yes
[12/Jul/2013 11:35:56] Sent: Queue-ID: 51dfdbdd-00000220, Recipient: <destinationemailaddress>, Result: delayed, Status: 4.4.1 Cannot connect to remote host

debug log:
[12/Jul/2013 11:35:11][6428] {smtpc} Sending email to SMTP server mx0.123-reg.co.uk, delivering mail from <myemailaddress>
[12/Jul/2013 11:35:11][6428] {smtpc} Connecting to 67.215.65.130 (mx0.123-reg.co.uk) using local interface 0.0.0.0...
[12/Jul/2013 11:35:34][6428] {smtpc} Cannot connect to mx0.123-reg.co.uk (IP address 67.215.65.130, local interface 0.0.0.0).
[12/Jul/2013 11:35:34][6428] {smtpc} Sending email to SMTP server mx1.123-reg.co.uk, delivering mail from <myemailaddress>
[12/Jul/2013 11:35:34][6428] {smtpc} Connecting to 67.215.65.130 (mx1.123-reg.co.uk) using local interface 0.0.0.0...
[12/Jul/2013 11:35:56][6428] {smtpc} Cannot connect to mx1.123-reg.co.uk (IP address 67.215.65.130, local interface 0.0.0.0).

Thanks
  •  
clan

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Your configuration seems to be wrong: 67.215.65.130 doesn't belong to 123-reg, but is an opendns ip address.
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hodgson

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Thanks for noticing that, been in touch with open dns and they said this:

"This is due to the fact that MX records for a particular domain inherit the category tags of the parent domain in our database
This is why we encourage our users to configure the outbound SMTP settings to use a non-filtered DNS service"

Is it possible to do this in Kerio? I added the correct lookups to the windows host file but that made no difference. In windows server if i ping the name it returns the correct IP.

Thanks
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Lisa Lyons (Kerio)

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You could try using 8.8.8.8 and 8.8.4.4 as your DNS servers?

https://developers.google.com/speed/public-dns/

Kerio Technical Support
Log Support Incidents here: http://www.kerio.com/support
Also, please use our KB: http://kb.kerio.com
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hodgson

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The reason we use open dns is to lock down the internet for users.
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hodgson

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We fixed this by changing the servers dns to 8.8.8.8, this by-passed open dns and the correct ip now responds.

Thanks for all your help
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