troubleshooting Question

SMTP communication problem -- #5.50 smtp; 550 Blocked

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zhuansunFlag for United States of America asked on
Microsoft IIS Web ServerEmail ServersEmail Protocols
11 Comments1 Solution8991 ViewsLast Modified:
Our classic asp web application will allow user to input their request information online, and send that information through email to our customer support staff.

the source code in xx.asp is:

            Set objMail = Server.CreateObject("CDONTS.NewMail")
            objMail.From="" // from user's filled in field
            objMail.Subject="Re: SMTP communication problem"
            objMail.Body="some email body"

            if objMail.To & "" <> "" then
            end if
            set objMail = nothing

This asp application worked fine before, and I even don't know it has some problem until this morning someone reported error message.
As I tested, if both objMail.From and objMail.To are like **@ourdomain, the receipt will receive email from System Administrator like following:

We user Windows 2003 server with IIS 6.0 and Exchange server 2003. is our domain.


Your message did not reach some or all of the intended recipients.

      Subject:      WEBSITE: Request for Intellectual Asset Management > Licensing Royalty Audit
      Sent:      10/30/2007 10:44 AM

The following recipient(s) could not be reached:

      Someone on 10/30/2007 10:44 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <xxxxxx.ourdomain #5.5.0 smtp;550 Blocked>
Dan McFadden
Technical Lead - Active Directory

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