On 09/17/02 at 14:23, NetHead wrote:
> I've posted a couple of questions about this before. We have a company in
> the UK with which we need to exchange e-mail. We can receive mail from
> them just fine. However, any e-mail addressed to them from within our
> network will fail.
Fail how? Does SIMS bounce the messages? Does the UK server bounce them? In
either case, what does the bounce message say? Does SIMS accept messages
and then fail to transmit them without bouncing? If so, does SIMS log any
error(s)? The first thing you need to determine is where the failure is
occuring. Is it on your server, on the destination server, your network,
their network, or somewhere in the 'net in between?
> We have checked the following items:
>
> -Reverse DNS look-up... our isp has set up reverse DNS records to our
> mail server and the company in the UK verifies that they can see them.
>
> -check for blacklisting or blockin... the isp in the UK claims that they
> are not blocking any of our ip's. They use SpamCop for their blacklist
> and we are not listed by SpamCop.
>
> -We are capable of reaching our intended recipient if we send from
> anywhere except our network. I can reach them via AOL; I can reach them
> using a dial-up connection that bypasses our router. The "break-down"
> seems to occur once I get behind the Cisco router that our isp has put
> on-site to connect us to the T-1. My isp denies that there router could
> be the problem. They feel that if it were there router, then ALL SMTP
> traffic would be affected, not just one particular domain/ip.
>
> I don't really think this forum is the proper place to address this issue
> any further.
Why not? It seems on-topic to me -- it involves a question of getting mail
to be delivered by a SIMS server. Whether or not the failure is SIMS'
fault, SIMS is still a part of the equation and if you can find a solution
it might benefit others on the list.
> But I could use some recommendations as to a good place to
> seek help. BOTH isp's are being very apathetic about this. Each says it
> must be something wrong with the other isp. I keep going round and round
> with them and getting nowhere. I'm sure there must be some test... some
> way of determining what is causing the "blockage".
>
> I'm looking for either a newsgroup or tech support list that would be
> appropriate to address this issue. Or if you know of a network "tool"
> that would allow me to test the connections and determine what the source
> of the block is, I'd be grateful.
Turn SIMS' SMTP logging all the way up to 'All Info', then try to send a
message to the 'problem' server and see what SIMS logs. That should tell
you 1) whether SIMS can make a connection to the UK server to begin with
and 2) if so, where in the SMTP exchange things go awry (if that's where
the problem lies). You might also want to try to telnet to port 25 on the
UK machine from your SIMS server and see if you can conduct an SMTP
conversation manually. If the other server will accept messages, but not
deliver them to their recipients, then the problem is on the other end. If
you can get the cooperation of the UK server's admin, you might ask what
their server logs show.
--
Christopher Bort | [EMAIL PROTECTED]
Webmaster, Global Homes | [EMAIL PROTECTED]
<http://www.globalhomes.com/>
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