Advertisement

01.30.2008 at 07:38AM PST, ID: 23123040
[x]
Attachment Details
[x]
The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

  • The Grade of the Solution
  • The Zone Rank of the Expert Providing the Solution
  • The Number of Author and Expert Comments
  • The Number of Experts Contributing
  • The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

6.4

SMTP Server in IIS is not forwarding to smarthost because of failed DNS lookups

Asked by volteurope in Simple Mail Transfer Protocol (SMTP), Windows 2003 Server, Domain Name Service (DNS)

Tags: , , ,

We have a Win 2003 Server running ISA 2004; acting as a gateway beetween our Exchange server and the outside world. On this gateway, IIS is set to forward all outbound email to a smarthost (our Anti-Spam provider) which is a DNS name. It was all working fine and no changes have been made, but one day outgoing email stopped, the email is queuing and the System Event Log full of ID 4000 messages like this:

"Message delivery to the remote domain 'hotmail.com' failed for the following reason: Unable to bind to the destination server in DNS. "

Inbound email is still fine (because a Remote Domain smarthost points internally by IP), and from the server you can still NSLookup quite happily, and Telnet on TCP 25 to the smarthost. So why has this stopped working? and why is IIS looking up the DNS for every outbound email when it's all pumped to a smart host anyway? Changing the smarthost to an IP address gets round the problem as there's no DNS lookups, but we need to use the DNS hostname because it points to a cluster of servers.
Start Free Trial
[+][-]01.30.2008 at 07:48AM PST, ID: 20777899

View this solution now by starting your 7-day free trial. Setting up your free trial is quick, easy, and secure. We will return you to this solution, unlocked, when you're done.

 

About this solution

Zones: Simple Mail Transfer Protocol (SMTP), Windows 2003 Server, Domain Name Service (DNS)
Tags: Microsoft, Windows Server 2003, IIS 6, IIS SMTP Server Failing to resolve DNS names
Sign Up Now!
Solution Provided By: omarfarid
Participating Experts: 1
Solution Grade: B
 
 
[+][-]01.30.2008 at 07:55AM PST, ID: 20777972

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]01.30.2008 at 08:02AM PST, ID: 20778068

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 7-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]01.30.2008 at 08:12AM PST, ID: 20778153

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02.11.2008 at 01:49AM PST, ID: 20865010

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]03.19.2008 at 07:19AM PDT, ID: 21161807

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]03.19.2008 at 07:25AM PDT, ID: 21161862

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 7-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]03.19.2008 at 07:38AM PDT, ID: 21161987

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]03.19.2008 at 07:49AM PDT, ID: 21162126

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 7-day free trial to view this Expert Comment or ask the Experts your question.

 
 
Loading Advertisement...
20080716-EE-VQP-32 / EE_QW_2_20070628