"452 4.3.1 Insufficient system resources" is logged in the CMN_ERROR.log file and message deliver (4235232)

A delay might be noticed on the routing of messages between Domino and Exchange and the following entries might be logged in the CMN_ERROR.log file:

^{2010-02-04 14:04:06,460 INFO  CMN.logging [932] - [796] Router closed.  Open Sockets: 0
2010-02-04 14:04:07,382 INFO  CMN.logging [932] - Connection from 10.1.100.1:4732
2010-02-04 14:04:07,398 INFO  CMN.logging [932] - [797] Established channel from Domino(10.1.100.1:4732) to Exchange(10.1.95.10:25).  Total Channels: 2
2010-02-04 14:04:07,398 INFO  CMN.SmtpProtocol.logging [932] - [797](2476)orig-^dest(2492)[10.1.100.1:4732]-^[10.1.95.10:25]: Read: 452 4.3.1 Insufficient system resources}

^{2010-02-04 14:04:07,398 WARN  CMN.logging [932] - [797](2476)orig-^dest(2492)[10.1.100.1:4732]-^[10.1.95.10:25]: Received response (452 4.3.1 Insufficient system resources) from command (None) router state (PassThrough)
2010-02-04 14:04:07,398 INFO  CMN.SmtpProtocol.logging [932] - [797](2476)orig<-dest(2492)[10.1.100.1:4732]<-[10.1.95.10:25]: Write: 452 4.3.1 Insufficient system resources}

^{2010-02-04 14:04:07,398 ERROR CMN.logging [932] - [797](2476)orig-^dest(2492)[10.1.100.1:4732]-^[10.1.95.10:25]: Socket closed during command (None).  Router state (PassThrough)}

At the same time there might be entries similar to the following in the Domino router log:

^{04/02/2010 14:20:35   Router: No messages transferred to CMNHOST.DOMAIN.COM (host CMNHOST.DOMAIN.COM) via SMTP: SMTP Protocol Returned a Transient Error}