You can define the policy groups, including in each policy group the users that share filtering requirements. If a message has multiple recipients with members in different policy groups, then the Scanner bifurcates the message (split it into one or more messages). Bifurcated messages for many policy groups can degrade performance. Use policy groups as necessary, but be aware that a large number of policy groups can affect performance.
Performance can be affected when a Control Center must collect logging and statistics from multiple Scanners. As you add Scanners, monitor performance to ensure that the additional Scanners do not degrade performance to unacceptable levels.
The higher the log levels, the more data the Control Center must consolidate over the network. Consider keeping log levels relatively low unless you are troubleshooting. You can also set logs to be purged more frequently.
Configure scheduled reports to run at times when utilization is low. This configuration helps reduce the demand on system resources during peak hours.
Store report data only for the reports you need, for the length of time you need.
When you configure the appliance to be a Control Center and a Scanner, the appliance requires the resources to fulfill both roles. In mid-sized environments and large environments, this configuration can slow performance. Consider setting up the Control Center and Scanner on separate appliances.
The following are Spam Quarantine performance implications:
The more messages that Symantec Messaging Gateway routes to Spam Quarantine, the larger the Quarantine becomes, and the more processing that is required. Reduce the maximum size of Spam Quarantine. You can delete the messages that are identified as spam or reduce spam retention time.
The more users that access Spam Quarantine, the more performance overhead that is required. Not allowing end user access to Spam Quarantines ca increase performance significantly.
LDAP lookups for message recipients against a limited capacity LDAP server can severely impair Spam Quarantine performance. Ensure that you have adequate capacity on your LDAP server.
The Spam Quarantine's SMTP server may slow down. If it does, the Scanner's delivery MTA could back up when the destination MTA accepts messages slowly or not at all. As such, some legitimate mail messages may be delayed.
Text-based attachment scanning
Symantec Messaging Gateway can scan attachments for spam in an email message. Enabling this option may result in slower performance of Symantec Messaging Gateway.
By default, the option is enabled in new installations of Symantec Messaging Gateway and disabled for upgrade. When this option is disabled, Symantec Messaging Gateway does not use all scanning technologies for evaluating the attachments for spam.
Enabling DKIM signing can impact outbound messaging performance. Using a shorter encryption key can reduce this impact.
SMTP authentication adds overhead that can impact outbound messaging performance.
Imported Document ID: HOWTO93041
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