A remote system issued a RCPT command to GMS but GMS was unable to process it because the system ran out of memory so GMS has asked the remote server to try sending the email again later.
In this case session Undefined was processing a connection from the server/client at Undefined apparently from Undefined when it received the command
so GMS responded with
This problem is most likely to be caused by
- too little memory in the system try adding more physical memory; or
- too little virtual memory try increasing the maximum paging file size.
Although this error will stop the email message being delivered, as soon as more memory becomes available, GMS will accept the message in the usual way.
Keywords:RCPT out of memory RFC821 RFC2821