We recently started having issues delivering email to hotmail.com, aol.com, and amtrak.com addresses (possibly more domains, but
haven't heard of others yet). They return the following error (email addresses have been altered):
Diagnostic information for administrators:
Generating server: edmironport.internal.edmondok.com
user@aol.com
#< #5.0.0 smtp; 5.4.7 - Delivery expired (message too old) 'DNS Soft Error looking up aol.com (MX) while asking recursive_nameserver1.parent. Error was: unable to reach nameserver on any valid IP' (delivery attempts: 0)> #SMTP#
Original message headers:
Received: from exch01.internal.edmondok.com ([192.168.xxx.xxx]) by
edmironport.edmondok.com with ESMTP; 29 Dec 2009 09:15:36 -0600
Received: from exch01.internal.edmondok.com ([192.168.xxx.xxx])
by edmironport.edmondok.com with ESMTP; 29 Dec 2009 09:15:40 -0600
Received: from EXCH01.internal.edmondok.com ([fe80::45fe:26d:54cd:6aeb]) by
EXCH01.internal.edmondok.com ([fe80::xxxx:xxxx:xxxx:xxxx%10]) with mapi; Tue, 29
Dec 2009 09:15:19 -0600
From: Internal User <user@edmondok.com>
To: User <user@aol.com>
Date: Tue, 29 Dec 2009 09:15:18 -0600
Subject: Blood Drive Today
Thread-Topic: Blood Drive Today
Thread-Index: AcqImccN9I6lWOw9QuGSrMji25lA2A==
Message-ID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx@EXCH01.internal.edmondok.com
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: multipart/alternative;
boundary="_000_08B7F743EE3EF44F8B51C43EEB8902C4034FF1F5EXCH01interaled_"
MIME-Version: 1.0
X-Auto-Response-Suppress: DR, OOF, AutoReply
Any ideas as to why this is occuring? I have the ironport appliance's (C150) DNS pointing to our internal DNS servers. I am able to resolve all mailservers to IPs via nslookup and can ping hotmail.com's servers, but not aol.com's or amtrak.com's (possibly by their design?). There are some MX issues with AOL and Amtrak, but not Hotmail. Any help is appreciated. Thanks,
Hans Schroeder | Network Specialist
City of Edmond | www.edmondok.com
hans.schroeder@edmondok.com
