Under Reporting / Logs / Mail log in the PGP Encryption Server (Symantec Encryption Management Server) administration console, there are errors referring to memory and messages may not be sent or received. The errors may contain text such as:
Cannot allocate memory
unable to determine error -- out of memory?
PGP Encryption Server 10.5 and above.
Memory fragmentation has occurred. This is generally the result of the PGP Encryption Server mail proxy service processing very high volumes of email and / or running for an extended period (hundreds of days for example) without being restarted.
To workaround this issue, navigate to System / General Settings in the administration console and click on the Restart Services button. This will restart all services, including the mail proxy.
To restart just the mail proxy service, ssh to PGP Encryption Server and enter this command:
pgpsysconf --restart pgpuniversal
If memory related errors occur regularly, consider restarting the mail proxy service daily or weekly. Please open a technical support case for assistance in doing this.