Problem sending email to certain domain...sometimes....

Intermittently I am having trouble sending email to a certain domain. The email appears to get sent, and then 24 hours later comes back. This happens with mail sent from my ISP and Yahoo.

The IP address is 69.73.182.72

Is there a way I could check connectivity to this address from different geographic locations? I can ping it without problem, making me think the problem is somewhere else?

Failing this, would you guys be able to test if you can ping/tracert it and post if you can and your location, Im guessing that somewhere there is a bad DNS record or something......
fox_stattonAsked:
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Chris DentPowerShell DeveloperCommented:

What's in the Non-Delivery Report you get back?

I can connect to it from London without problem.

Chris
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fox_stattonAuthor Commented:
This is the error message, Ive obscured the email address:

> This is the Postfix program at host smtp1.bethere.co.uk.

> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below.

> For further assistance, please send mail to <postmaster>

> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.

> The Postfix program

> <xxxxx@imperialmark.org>: lost connection with
>    imperialmark.org[69.73.182.72] while sending MAIL FROM
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Chris DentPowerShell DeveloperCommented:

Ahh, I see what you mean, nice and ambiguous.

You could check the route is reliable using something like WinMTR (http://winmtr.sourceforge.net/), if you get a lot of dropped packets at certain points in the route then it might indicate a problem.

Otherwise you can check their configuration using a site like www.dnsreport.com (against their domain name), that'll run some basic tests of the mail services.

Chris
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fox_stattonAuthor Commented:
Thanks for this, it did come up with some errors that Ive sent to the web host.

Ive also set up a test email account ( eetest@icharter.org ) , could you guys send a test email to it and I can check if it gets delivered. If you get a bounce back message (it usually comes 24 hours later) could you post it here for analysis

Many thanks,

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fox_stattonAuthor Commented:
Also, you can view the dns report at http://www.icharter.org/dnsreport.pdf

Anyone see anything obvious?
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Chris DentPowerShell DeveloperCommented:

Well there's the lack of RFC compliance, never a good sign when you have to make so many different mail systems talk to each other.

Chris
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fox_stattonAuthor Commented:
is the lack of reverse DNS a serious issue?
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Chris DentPowerShell DeveloperCommented:

It can be, quite a large number of systems (including Hotmail, AOL, etc) will reject mail if it's sent from a system without a correct set of DNS records.

Chris
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fox_stattonAuthor Commented:
but that wouldnt affect mail being received? The main problem here seems to be that various smtp servers dont seem to be able to connect to the IP address of the icharter.org mail server.
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Chris DentPowerShell DeveloperCommented:

No, Reverse DNS won't effect that system receiving mail from other sources.

From the places that can't connect, can they route all the way there? Or is that something you wouldn't be able to check?

Chris
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fox_stattonAuthor Commented:
I dont think I can check that, the first place is smpt1.bethere.co.uk. the smtp server, dnsreports also couldnt connect.

I seem able to connect with that IP address withouth problem. That said, if anyone on here has sent any test messages, I haven received them
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Chris DentPowerShell DeveloperCommented:

I dropped one through earlier, waiting to see what happens with that, it was via my mailhost, so couldn't check how well it went through the servers.

When I try from here the connection drops after a few seconds. However, if it holds long enough I can submit a message directly into the server (you should have that, if I typed everything correctly and it doesn't get blocked as spam for spoofing).

In terms of the network, you're not actually far from me, only 8 hops and I'm there, 4 of those are my side. Doesn't leave a lot to go wrong along the way.

Unless the SMTP server is going wrong I would have to suspect a problem on the borders (or just beyond the borders) of your network / ISP.

Chris
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