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XFOR: IMS Outbound Queue Backlog - SMTP Error 499

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Symptoms

The Outbound Awaiting Delivery queue of the Microsoft Exchange Server Internet Mail Service has a backlog of messages, and the Internet Mail Service is repeatedly attempting delivery to a remote host. The remote host can be either a firewall with an SMTP daemon installed or an SMTP host.

The Internet Mail Service's Simple Mail Transfer Protocol (SMTP) log contains the following conversation between the Internet Mail Service and the host it is connecting to:
4/5/99 10:22:41 AM : A connection to 10..1.1.1 was established.

4/5/99 10:22:41 AM : IO: |220 r40.domain.com InterLock SMTP Gateway 3.0 ready at Mon, 5 Apr 1999 10:22:41 -0400

4/5/99 10:22:41 AM : EHLO xxmims2.srv.dom.com

4/5/99 10:22:41 AM : IO: |250-Hello xxmims2.srv.dom.com, pleased to meet you

4/5/99 10:22:41 AM : MAIL FROM:bob@dom.com

4/5/99 10:22:42 AM : IO: |250 bob@dom.com... Sender ok

4/5/99 10:22:42 AM : RCPT TO:sam@tool.com

4/5/99 10:22:42 AM : IO: |250 sam@tool.com... Recipient ok

4/5/99 10:22:42 AM : DATA

4/5/99 10:22:43 AM : IO: |354 Enter mail, end with "." on a line by itself

4/5/99 10:22:43 AM : 354 Enter mail, end with "." on a line by itself

4/5/99 10:22:44 AM : 499 No routing hosts are reachable for tool.com. Message subject: ""Case 27375"". Rescheduling delivery for later.

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More information

A 499 Error: "No routing hosts are reachable," indicates that the TCP connection has been dropped. To determine exactly what is happening, a network trace is required.

If the host the Internet Mail Service is connecting to sends a reset command to the Internet Mail Service, it causes the connection to be dropped.

If the connection is interrupted and a 400 series SMTP response is generated, the Internet Mail Service will immediately try to resend the queued messages. The behavior of the Exchange Server Internet Mail Service is compliant with RFC-821.

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Properties

Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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Keywords: KB228725, kbprb

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Article Info
Article ID : 228725
Revision : 6
Created on : 10/28/2006
Published on : 10/28/2006
Exists online : False
Views : 258