I'm betting the Exchange server's advertised name and the IP a reverse
lookup renders do not much thus earthlink is kicking it back as spam.
----- Original Message -----
From: "Couch, Nate" <[EMAIL PROTECTED]>
To: "Exchange Discussions" <[EMAIL PROTECTED]>
Sent: Wednesday, August 29, 2001 12:04 PM
Subject: IMC problem with Earthlink.net
> Scenario:
>
> MS Exchange 5.5. SP4
> MS Exchange/Outlook 98 for the clients.
> IMC through UU.NET
>
>
> Here is what I am encountering:
>
> 1) IMC functions fine for just about everyone we send to EXCEPT
> Earthlink.net
>
> 2) Based on the rules we have setup on the firewall the messages for
> Earthlink are leaving the firewall destined most often for
> mx00.earthlink.net.
>
> 3) When we send to earthlink.net addresses we get:
>
> "Unable to deliver the message due to a communications error"
>
> 4) Our ISP engineer and they can send email to earthlink from the firewall
> as a company.com address so they tell me. However, anyone from inside the
> firewall sending to earthlink.com gets kicked back with the above error
> code.
>
> 5) It seems that something on the earthlink.net side does not like
whatever
> MS Exchange is doing to the outbound messages. Inbound works fine so far.
> Headers reveal that earthlink.net is using:
>
> 220 eagle EL_3_4_2 /EL_3_4_1 ESMTP EarthLink SMTP Server
>
> 6) I have checked the IMC and found no filters nor any weird configuration
> (I haven't changed anything on the setup for the IMC in months and this
> whole thing started up about four weeks ago.
>
> 7) I haven't found anything in the archives, FAQ, or Technet for the above
> error code (at least nothing helpful). I am not seeing anything strange
in
> the Event logs (not sure if I really would, but checked anyway just to be
> sure).
>
> 8) Message Tracking doesn't reveal much information as to why the message
is
> not being delivered.
>
> 9) Earthlink.net Tech Support hasn't been much help to date.
>
> Anyone have any ideas as to what could be causing this? My feeling is
that
> either company.com is being blocked due to spam being sent from us (I
> checked UXN Spam Combat and did not find our domain listed, but did find
> UU.NET listed). Or, more likely the MS Exchange IMC and earthlink.net are
> not talking the same language.
>
> Regards.
>
> Nate Couch
> EDS Messaging
>
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