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cant send e-mails


Hope someone can help?

I have this ongoing problem that seemed to be ok for a while but now our office abroad cant send e-mails. When i log onto thier server>exchange server manager>smtp and look at the queues. all seems fine until you get to the SMTP connector and its status is at retry state ad has the description: unable to bind to the destination server in DNS.

What does this mean and what should i look at in resloving this issue?

thank you
Windows Networking

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Keith Alabaster

8/22/2022 - Mon


Oh you need to look at the assisted answer.
Keith Alabaster

How do you normally deliver your email? By DNS or by a smarthost?
If its by DNS, then the issue is normally due to the fact that the email server cannot resolve the mail server.

Use something like www.dnsreport.com and put in the name of the domain that the smtp server is trying to contact (xxxx.com, for example).
This will show if the mail server of that domain is available, its towards the bottom of the results.

If this shows it is working ok, get to a cmd prompt on the Exchange box.
try an nslookup of the destination mail server; does it resolve OK?

If not, your DNS is failing you. Are you using forwarders on your DNS server?
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William Peck


I have started from the top of the list and working down. I did a dns check via the website www.dnsreport.com. and my last three entries were

WARN Glue at parent nameservers WARNING. The parent servers (I checked with dns2.iacmail.com.) are not providing glue for all your nameservers. This means that they are supplying the NS records (host.example.com), but not supplying the A records (, which can cause slightly slower connections, and may cause incompatibilities with some non-RFC-compliant programs. This is perfectly acceptable behavior per the RFCs. This will usually occur if your DNS servers are not in the same TLD as your domain (for example, a DNS server of "ns1.example.org" for the domain "example.com"). In this case, you can speed up the connections slightly by having NS records that are in the same TLD as your domain.

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 FAIL NS A timeout occurred getting the NS records from your nameservers! None of your nameservers responded fast enough. They are probably down or unreachable. I can't continue since your nameservers aren't responding. If you have a Watchguard Firebox, it's due to a bug in their DNS Proxy, which must be disabled (31 Jul 2006 UPDATE: several years after being informed of this, there is a rumor that there is a fix that allows the DNS  

Could some one suggest something about this. thx for all your help so far
Keith Alabaster

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Keith Alabaster

Thank you :)