HTTP protocol options
By checking the "Allow HTTP Keep-Alive" option, you allow permanent HTTP connections for the WebMail service.
Next, you can set the HTTP limits for WebMail requests. Use the "Limit HTTP Request" header to option in order to specify the maximum allowed size for incoming HTTP headers, and the "Limit HTTP Request" body to option in order to specify the maximum allowed size for incoming HTTP body. The third option, "Limit file uploads", can be used to set the maximum allowed size for incoming upload data. It applies to attachments, mail body and contact import operations. All size values can be set by using the up and down arrows, in KB or MB and only for the "Limit file uploads" option in GB.
Select the appropriate action to be taken when the incoming data is over the set limits by using the If any of the above limits is exceeded option. Use the drop-down menu in order to choose between closing the connection immediately or allowing all data to be sent.
Logging
You can select several types of messages to be logged for the WebMail service: critical messages, error messages, warning messages, informational messages and protocol communication. To select which of these are to be logged, click the "Log Level" slider and move it to the left or to the right. The selected types of messages will change color from whiter to blue.
Log files can be stored using your internal log files, your system's log files or within the log files located on a remote system. Use the "Log" drop-down menu to select where to have your log files saved.
Thread management
Thread management allows you to set different numbers of processing threads for the WebMail service, depending on your traffic load. First, using the up and down arrows, set a number of threads to be allotted when the WebMail service is started. To have a different number of threads for peak periods, check the overload option and use the up and down arrows to choose the thread number.
Depending on your WebMail service load, you can increase the number of processing threads which can lead to increased performance and response time for this service. However this increase should be made very carefully and making sure that the server hardware can provide the processing and memory resources required by a higher number of threads. The default setting of 2 starting threads and an increase on overload to 20 threads is recommended.
When you are done configuring these parameters, remember to click the "Save Configuration" button to preserve your changes.
WebMail options
Use the drop-down boxes in the "WebMail interface" section to choose the WebMail interface type that users can access and the default interface that will be used when accessing the WebMail service.
You can check the box related to the "Allow domain selection on login" option in order to display a drop-down with the list of domains when users access the WebMail login page.
Set the parameters for WebMail sessions by using the two options in the Session section. You can specify after what interval an inactive (idle) / active WebMail session is closed. Values for these parameters can be entered in seconds, minutes, hours or days, by using the up and down arrows.