Cisco Cisco Email Security Appliance X1070 故障排查指南
Why do I see the error "452 4.3.1 Insufficient
system resources" when I deliver to my own
domain?
system resources" when I deliver to my own
domain?
Document ID: 117923
Contributed by Stephan Fiebrandt, Cisco TAC Engineer.
Jul 16, 2014
Jul 16, 2014
Contents
Introduction
Problem
Solution
Example SMTP conversation
Problem
Solution
Example SMTP conversation
Introduction
This document describes an error (soft bounce) message that you might receive during communication with
nexthop Simple Mail Transfer Protocol (SMTP) Server(s).
nexthop Simple Mail Transfer Protocol (SMTP) Server(s).
Problem
The Delivery Connection ID (DCID) shows this message
452 4.3.1 Insufficient system resources
for the nexthop SMTP server. Messages are queued up on the Cisco Email Security Appliance (ESA).
Solution
Beginning with Microsoft Exchange 2007, a Back Pressure mode has been introduced. The most common
reason why Microsoft Exchange will defer any message (except from its own domain) is because the disk
space for the Exchange transport agent went below 4GB. The only solution is either to increase the disk space
or move the queue to another partition with enough space.
reason why Microsoft Exchange will defer any message (except from its own domain) is because the disk
space for the Exchange transport agent went below 4GB. The only solution is either to increase the disk space
or move the queue to another partition with enough space.
Example SMTP conversation
helo exchange
220 MAIL01.exchange.com Microsoft ESMTP MAIL Service ready at
Thu, 16 Jul 2009 07:09:42 −0500
250 MAIL01.exchange.com Hello [192.168.2.40]
mail from:<>
452 4.3.1 Insufficient system resources
Updated: Jul 16, 2014
Document ID: 117923