Configuring POP3 Settings

In addition to SMTP traffic, InterScan™ Messaging Security Appliance (IMSA) can scan POP3 messages at the gateway as your clients retrieve them.

To use the POP3 message filter, enable Accept POP3 connection from Summary > System screen. This option is not selected by default.

To configure POP3 settings:

  1. Choose Administration > IMSA Configuration > Connections. The Components tab displays by default.

  2. Click the POP3 tab.

  3. To configure a connection from unknown POP3 servers on the Internet, type the port number IMSA uses for incoming POP3 connections under Generic POP3 Connection.

  4. To configure connections from specific POP3 servers, do the following:

    1. Click Add under Dedicated POP3 Connections. The Dedicated POP3 Connection window appears.

  1. Under Message Text, modify the message that IMSA will send to users if email messages that they are trying to receive trigger a filter and are quarantined or deleted.

  2. Click Save.

The incoming port on your scanners must be idle or the IMSA daemon might not function properly.

 

About configuring POP3 generic services

For a generic POP3 service, the POP3 client logs on using the USER command and specifies the actual POP3 server and optional port number along with the user's name using the UserServerSeparator character to separate the values.  

Example 1: To connect user "User1" to server "Server1", and the UserServerSeparator character is "#", the client issues the following USER command:

  USER User1#Server1  

Example 2: To connect to port 2000 on Server1, the following command would be used:  

  USER User1#Server1#2000

If you do not specify a port number, IMSA uses the default value of 110.

The following example shows how to configure generic POP3 settings for Outlook:

  1. Specify the POP3 server address with IMSA scanner IP 192.168.11.147.

  2. Type user name test123#192.168.11.252.

  3. Set POP3 port to 110.

 

The separator symbol ‘#’ can be configured in IMSA.ini file using the key user_server_separator.

 

About configuring POP3 dedicated services

For a POP3 dedicated service, the POP3 service always connects to a specific POP3 server. IMSA uses this service for a POP log on and for any type of log on using the AUTH command. For this service, a separate port on the proxy has to be set up for each specific POP3 server that any client might want to connect to.

The following example shows how to configure dedicated POP3 settings in Outlook:

  1. Specify the POP3 server address with IMSA scanner IP 192.168.11.147.

  2. Type user name test123.

  3. Set the POP3 port to 1100 which is the port that IMSA dedicated POP3 service is listening on.

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