Ask the Expert

Tool helps identify inbound Exchange Server email flow issues

I'm running Exchange Server 2003 Service Pack (SP) 2 on Windows Server 2003. Recently, I had a spammer use my SMTP server to spam people, and now my Exchange server is not accepting new email. I've tried to telnet port 25, but without success. I've also tried using SmtpDiag, reinstalling Exchange 2003 SP2 and restarting the server to the last known 'good' configuration. What else do you recommend?

    Requires Free Membership to View

I'm going to assume that you are not using Windows Small Business Server (SBS) and, therefore, ISA Server is not playing a part in this. There is a fantastic tool called SmtpDiag.exe available for download from Microsoft. It will help you identify why inbound email is not being accepted. If your external MX records were altered, it could cause telnet and other hosts to point at the wrong server.

Since you mentioned that you were just the victim of an open SMTP relay from a spammer, you'll also want to make sure that your outbound email is not adversely affected. You can check to see if your SMTP host IP address is on a blocklist at Spamhaus.

Do you have comments on this Ask the Expert Q&A? Let us know.

Ask an Exchange Server question in our forum.

This was first published in September 2008

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: