Through Service Configuration system administrators can manage logging, authentication and encryption, error and thread control parameters and backend server connection settings.
Logging
You can select several types of messages to be logged for the POP3 Proxy 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 transparent to gray.
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.
Encryption and Authentication
The POP3 Proxy service allows only one authentication method which is PLAIN. Therefore as it is recommended to use StartTLS or SSL to enhance connection security, please check the Allow StartTLS option in the Encryption and Authentication section. Should you like your proxy to handle the authentication, check the Perform authentication on proxy option. Alternatively, the authentication will be performed on the back-end server.
Error Control
To set a maximum number of errors caused by invalid commands received from clients or by failed authentication attempts check the respective options in the Error Control area of the POP3 Proxy service. Use the up and down arrows corresponding to each of these options to set a specific number of errors.
Thread Management
Thread management allows you to set different numbers of processing threads for the POP3 Proxy service depending on your traffic load. First, using the up and down arrows, set a number of threads to be allotted when the POP3 Proxy 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.
Back-end Server Connection Settings
To set a specific sending and receiving timeout first check the respective option in the Back-end Server Connection Settings section. The timeout is computed in miliseconds (use the up and down arrows or edit the respective text field to increase or decrease the default value) and ranges between 10 and 65535.
The total number of connections established on the back-end server can be limited by checking the corresponding option. Use the up and down arrows or edit the respective text field to increase or decrease the default value - possible values range between 1 and 65535 connections.
In order to overwrite the default local network interface used for back-end server connections check the corresponding option and type the respective interface in the Local network interface IP address field.
Use a secure (SSL enabled) connection when accessing the back-end server by checking the corresponding option in the Back-end Server Connection Settings section.
POP3 Proxy Options
The administrator is able to configure the greeting string at POP3 Proxy service level. This option is available as a service configuration from both CLI and WebAdmin. When defining the greeting string, the administrator uses the following placeholders (note that the placeholders are case sensitive):
- %H = network hostname of the server machine
- %D = network hostname.domainname of the server machine (FQDN)
- %A = listener IP
- %P = listener port
- %U = APOP ID in followin format number.number@hostname.domainname
- %V = axigen version
- %% = %
When you are done configuring these parameters, remember to hit the Save Configuration button to preserve your changes.