How to use SMTP Diagnostics 1.0 to troubleshoot IIS issues

Per Microsoft:

"SMTPDiag issues DNS queries using both User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) to validate that the queries will succeed. If TCP queries fail, mail will not be delivered successfully.

At this point, the network DNS infrastructure must be investigated. When all the DNS records have been successfully queried, the tool will try to connect to all the MX (mail exchange) records that were published for the remote domain on port 25 and try to do an EHLO, mail from, rcpt to, and quit command."

Key features

• Makes test requests based on user-inputted information, such as sender and receiver
• Validates that DNS MX records are configured correctly
• Ensures that the correct firewall or proxy ports are open for SMTP to properly work
• Ensures the correct permissions on the relevant SMTP directories such as BadMail, Pickup, etc.

To use the SMTP Diagnostics utility:

1. Go to Start -> Run.>p>
2. Type command and hit Enter.
3. Once the command window is open, type: cd

Now type: cd "Program Files\IIS Resources\SMTPDiag"

4. Finally, enter the following syntax to use the tool:

SMTPDIAG "sender address" "recipient address" [-d target DNS] [/v]

Below is a look at the results. (Email servers, email addresses, DNS servers, etc. are blocked out though, of course.)

Inside the IIS Diagnostics Toolkit

 Introduction
 How to install the Microsoft IIS Diagnostics Toolkit
 How to use SSL Diagnostics 1.0
 How to use Authentication and Access Control Diagnostics (AuthDiag) 1.0
 How to use Exchange Server SMTP Diagnostics 1.0
 How to use Log Parser 2.2
 How to use WFetch 1.4
 How to use Trace Diagnostics
 How to use Debug Diagnostics 1.0

About the author: Tim Fenner (MCSE, MCSA: Messaging, Network+ and A+) is a senior systems administrator who oversees a Microsoft Windows, Exchange and Office environment. He is also an independent consultant who specializes in the design, implementation and management of Windows networks.

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