I am receiving ndr's from one particular domain only.

Hello all,

I am running exchange 5.5 server all patched, since Tuesday I have not been able to email anyone at a customers site, they use a 3rd party email provider and I have explained to them (the provider) that I can't establish a telnet session from my exchange server, but I can from my desktop with a different public ip, but if I set the default gateway on my pc to the one I use for exchange I get the same result. I see the email hit my firewall and go out but I immediately get the ndr, they are requesting the logs from my exchange server but I am not sure if we are looking in the wrong place to resolve this problem. I haven’t changed anything and they claim no changes were made on their side. Any suggestions are appreciated.      
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Posting the results of the DNS report wasn't exactly what I was looking for, you could have included a link to the report:


I will confess that I didn't read your version of the report, I found the domain name and ran my own.

GoDaddy are not the most helpful of people, probably due to the way they run their operation - it is stripped down to the core services only - working on the numbers.

Two things that immediately jump out.

1. You are on a DSL connection. Many servers will have a problem with that.
2. Whatever is answering your SMTP traffic is not announcing itself correctly. Has someone changed something to try and hide the Exchange server, or do you have something in between Exchange and the internet?

And what does the NDR say?

jimmyz1966Author Commented:

here is a copy of the NDR

The following recipient(s) could not be reached:

'apsupport@godaddy.com' on 10/25/2006 10:05 AM

The recipient name is not recognized

The MTS-ID of the original message is: c=US;a= ;p=ARC GROUP ASSOCI;l=EXCHANGE-061025140513Z-68783

'Kerry Kellerman' on 10/25/2006 10:05 AM

The recipient name is not recognized

The MTS-ID of the original message is: c=US;a= ;p=ARC GROUP ASSOCI;l=EXCHANGE-061025140513Z-68783

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The NDR means what it says - it was rejected with "the recipient name is not recognised".
I also know that GoDaddy are very picky with some of their email servers about who they will accept email from, so you may well have been caught in that.
Put your domain in to dnsreport.com and see what it shows. That sites shows what the internet can see for your domain and email servers.

jimmyz1966Author Commented:
Simon, first of all thanks for your help this has been driving me crazy and godaddy flat out refuse any assistance at all,but here is the responce.

Parent PASS Missing Direct Parent check OK. Your direct parent zone exists, which is good. Some domains (usually third or fourth level domains, such as example.co.us) do not have a direct parent zone ('co.us' in this example), which is legal but can cause confusion.
INFO NS records at parent servers Your NS records at the parent servers are:

ns1.digizip.com. [] [TTL=172800] [US]
ns2.digizip.com. [] [TTL=172800] [US]

[These were obtained from b.gtld-servers.net]
PASS Parent nameservers have your nameservers listed OK. When someone uses DNS to look up your domain, the first step (if it doesn't already know about your domain) is to go to the parent servers. If you aren't listed there, you can't be found. But you are listed there.
PASS Glue at parent nameservers OK. The parent servers have glue for your nameservers. That means they send out the IP address of your nameservers, as well as their host names.
PASS DNS servers have A records OK. All your DNS servers either have A records at the zone parent servers, or do not need them (if the DNS servers are on other TLDs). A records are required for your hostnames to ensure that other DNS servers can reach your DNS servers. Note that there will be problems if your DNS servers do not have these same A records.
NS INFO NS records at your nameservers Your NS records at your nameservers are:

ns1.digizip.com. [] [TTL=86400]
ns2.digizip.com. [] [TTL=86400]

FAIL Open DNS servers ERROR: One or more of your nameservers reports that it is an open DNS server. This usually means that anyone in the world can query it for domains it is not authoritative for (it is possible that the DNS server advertises that it does recursive lookups when it does not, but that shouldn't happen). This can cause an excessive load on your DNS server. Also, it is strongly discouraged to have a DNS server be both authoritative for your domain and be recursive (even if it is not open), due to the potential for cache poisoning (with no recursion, there is no cache, and it is impossible to poison it). Also, the bad guys could use your DNS server as part of an attack, by forging their IP address. Problem record(s) are:
Server reports that it will do recursive lookups. [test]
Server reports that it will do recursive lookups. [test]

See this page for info on closing open DNS servers.
PASS Mismatched glue OK. The DNS report did not detect any discrepancies between the glue provided by the parent servers and that provided by your authoritative DNS servers.
PASS No NS A records at nameservers OK. Your nameservers do include corresponding A records when asked for your NS records. This ensures that your DNS servers know the A records corresponding to all your NS records.
PASS All nameservers report identical NS records OK. The NS records at all your nameservers are identical.  
PASS All nameservers respond OK. All of your nameservers listed at the parent nameservers responded.
PASS Nameserver name validity OK. All of the NS records that your nameservers report seem valid (no IPs or partial domain names).
PASS Number of nameservers OK. You have 2 nameservers. You must have at least 2 nameservers (RFC2182 section 5 recommends at least 3 nameservers), and preferably no more than 7.
PASS Lame nameservers OK. All the nameservers listed at the parent servers answer authoritatively for your domain.
PASS Missing (stealth) nameservers OK. All 2 of your nameservers (as reported by your nameservers) are also listed at the parent servers.
PASS Missing nameservers 2 OK. All of the nameservers listed at the parent nameservers are also listed as NS records at your nameservers.  
PASS No CNAMEs for domain OK. There are no CNAMEs for arcgroup.net. RFC1912 2.4 and RFC2181 10.3 state that there should be no CNAMEs if an NS (or any other) record is present.
PASS No NSs with CNAMEs OK. There are no CNAMEs for your NS records. RFC1912 2.4 and RFC2181 10.3 state that there should be no CNAMEs if an NS (or any other) record is present.
PASS Nameservers on separate class C's OK. You have nameservers on different Class C (technically, /24) IP ranges. You must have nameservers at geographically and topologically dispersed locations. RFC2182 3.1 goes into more detail about secondary nameserver location.
PASS All NS IPs public OK. All of your NS records appear to use public IPs. If there were any private IPs, they would not be reachable, causing DNS delays.
PASS TCP Allowed OK. All your DNS servers allow TCP connections. Although rarely used, TCP connections are occasionally used instead of UDP connections. When firewalls block the TCP DNS connections, it can cause hard-to-diagnose problems.
PASS Single Point of Failure OK. It appears that your nameservers are on separate physical servers, and we did not detect the same firewall in front of all servers. We check this mainly because some people have 2 NS records that point to different IPs on the same DNS server.
INFO Nameservers versions Your nameservers have the following versions: "9.2.4" "9.2.4"
PASS Stealth NS record leakage Your DNS servers do not leak any stealth NS records (if any) in non-NS requests.
SOA INFO SOA record Your SOA record [TTL=86400] is:
Primary nameserver: ns1.digizip.com.
Hostmaster E-mail address: alan.rsvmille.net.
Serial #: 1157127461
Refresh: 10800
Retry: 3600
Expire: 604800
Default TTL: 86400
PASS NS agreement on SOA serial # OK. All your nameservers agree that your SOA serial number is 1157127461. That means that all your nameservers are using the same data (unless you have different sets of data with the same serial number, which would be very bad)! Note that the DNS Report only checks the NS records listed at the parent servers (not any stealth servers).
PASS SOA MNAME Check OK. Your SOA (Start of Authority) record states that your master (primary) name server is: ns1.digizip.com.. That server is listed at the parent servers, which is correct.
PASS SOA RNAME Check OK. Your SOA (Start of Authority) record states that your DNS contact E-mail address is: alan@rsvmille.net. (techie note: we have changed the initial '.' to an '@' for display purposes).  
WARN SOA Serial Number WARNING: Your SOA serial number is: 1157127461. That is OK, but the recommended format (per RFC1912 2.2) is YYYYMMDDnn, where 'nn' is the revision. For example, if you are making the 3rd change on 02 May 2006, you would use 2006050203. This number must be incremented every time you make a DNS change.

Your SOA serial appears to be the number of seconds since midnight 01 Jan 1970 when the last DNS change was made (tinydns format). That works out to be Fri Sep 01 12:17:41 2006 EST.  
PASS SOA REFRESH value OK. Your SOA REFRESH interval is : 10800 seconds. This seems normal (about 3600-7200 seconds is good if not using DNS NOTIFY; RFC1912 2.2 recommends a value between 1200 to 43200 seconds (20 minutes to 12 hours)). This value determines how often secondary/slave nameservers check with the master for updates.
PASS SOA RETRY value OK. Your SOA RETRY interval is : 3600 seconds. This seems normal (about 120-7200 seconds is good). The retry value is the amount of time your secondary/slave nameservers will wait to contact the master nameserver again if the last attempt failed.
PASS SOA EXPIRE value OK. Your SOA EXPIRE time: 604800 seconds. This seems normal (about 1209600 to 2419200 seconds (2-4 weeks) is good). RFC1912 suggests 2-4 weeks. This is how long a secondary/slave nameserver will wait before considering its DNS data stale if it can't reach the primary nameserver.
PASS SOA MINIMUM TTL value OK. Your SOA MINIMUM TTL is: 86400 seconds. This seems normal (about 3,600 to 86400 seconds or 1-24 hours is good). RFC2308 suggests a value of 1-3 hours. This value used to determine the default (technically, minimum) TTL (time-to-live) for DNS entries, but now is used for negative caching.
MX INFO MX Record Your 1 MX record is:
10 mail.arcgroup.net. [TTL=86400] IP= [TTL=86400] [US]
PASS Low port test OK. Our local DNS server that uses a low port number can get your MX record. Some DNS servers are behind firewalls that block low port numbers. This does not guarantee that your DNS server does not block low ports (this specific lookup must be cached), but is a good indication that it does not.
PASS Invalid characters OK. All of your MX records appear to use valid hostnames, without any invalid characters.
PASS All MX IPs public OK. All of your MX records appear to use public IPs. If there were any private IPs, they would not be reachable, causing slight mail delays, extra resource usage, and possibly bounced mail.
PASS MX records are not CNAMEs OK. Looking up your MX record did not just return a CNAME. If an MX record query returns a CNAME, extra processing is required, and some mail servers may not be able to handle it.
PASS MX A lookups have no CNAMEs OK. There appear to be no CNAMEs returned for A records lookups from your MX records (CNAMEs are prohibited in MX records, according to RFC974, RFC1034 3.6.2, RFC1912 2.4, and RFC2181 10.3).
PASS MX is host name, not IP OK. All of your MX records are host names (as opposed to IP addresses, which are not allowed in MX records).
INFO Multiple MX records NOTE: You only have 1 MX record. If your primary mail server is down or unreachable, there is a chance that mail may have troubles reaching you. In the past, mailservers would usually re-try E-mail for up to 48 hours. But many now only re-try for a couple of hours. If your primary mailserver is very reliable (or can be fixed quickly if it goes down), having just one mailserver may be acceptable.
PASS Differing MX-A records OK. I did not detect differing IPs for your MX records (this would happen if your DNS servers return different IPs than the DNS servers that are authoritative for the hostname in your MX records).
PASS Duplicate MX records OK. You do not have any duplicate MX records (pointing to the same IP). Although technically valid, duplicate MX records can cause a lot of confusion, and waste resources.
PASS Reverse DNS entries for MX records OK. The IPs of all of your mail server(s) have reverse DNS (PTR) entries. RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry. Note that this information is cached, so if you changed it recently, it will not be reflected here (see the www.DNSstuff.com Reverse DNS Tool for the current data). The reverse DNS entries are: 195.muoa.pitt.washdctt.dsl.att.net. [TTL=171964]

Mail PASS Connect to mail servers OK: I was able to connect to all of your mailservers.
WARN Mail server host name in greeting WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.

mail.arcgroup.net claims to be invalid hostname 'SMTP':
   220 SMTP service ready
PASS Acceptance of NULL <> sender OK: All of your mailservers accept mail from "<>". You are required (RFC1123 5.2.9) to receive this type of mail (which includes reject/bounce messages and return receipts).
PASS Acceptance of postmaster address OK: All of your mailservers accept mail to postmaster@arcgroup.net (as required by RFC822 6.3, RFC1123 5.2.7, and RFC2821 4.5.1).
PASS Acceptance of abuse address OK: All of your mailservers accept mail to abuse@arcgroup.net.
INFO Acceptance of domain literals WARNING: One or more of your mailservers does not accept mail in the domain literal format (user@[]). Mailservers are technically required RFC1123 5.2.17 to accept mail to domain literals for any of its IP addresses. Not accepting domain literals can make it more difficult to test your mailserver, and can prevent you from receiving E-mail from people reporting problems with your mailserver. However, it is unlikely that any problems will occur if the domain literals are not accepted (mailservers at many common large domains have this problem).

mail.arcgroup.net's postmaster@[] response:
    >>> RCPT TO:<postmaster@[]>
    <<< 554 Transaction failed

PASS Open relay test OK: All of your mailservers appear to be closed to relaying. This is not a thorough check, you can get a thorough one here.
mail.arcgroup.net OK: 554 Transaction failed
WARN SPF record Your domain does not have an SPF record. This means that spammers can easily send out E-mail that looks like it came from your domain, which can make your domain look bad (if the recipient thinks you really sent it), and can cost you money (when people complain to you, rather than the spammer). You may want to add an SPF record ASAP, as 01 Oct 2004 was the target date for domains to have SPF records in place (Hotmail, for example, started checking SPF records on 01 Oct 2004).  
 INFO WWW Record Your www.arcgroup.net A record is:

www.arcgroup.net.  CNAME  arcgroup.net. [TTL=86400]
arcgroup.net.  A [TTL=86400] [US]

PASS All WWW IPs public OK. All of your WWW IPs appear to be public IPs. If there were any private IPs, they would not be reachable, causing problems reaching your web site.
PASS CNAME Lookup OK. You do have a CNAME record for www.arcgroup.net, which can cause some confusion. However, this is legal. Your CNAME entry also returns the A record for the CNAME entry, which is good -- otherwise, it would require an extra DNS lookup, which slightly delays the initial access to the website and use extra bandwidth. Note that if the CNAME points to another CNAME, it will likely cause problems.
INFO Domain A Lookup Your arcgroup.net A record is:

arcgroup.net.  A [TTL=86400]


jimmyz1966Author Commented:

sorry about that, yes I have a watchguard Firebox that proxys my outbound.  

Not a great fan of proxy firewalls. Try turning it off and see what happens then.

jimmyz1966Author Commented:

will do...thanks  
jimmyz1966Author Commented:

Problem Resolved, godaddy was blocking.  
jimmyz1966Author Commented:

By the way thanks again for your time
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