Configuring the POP3 Server

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To configure the POP3 server:

1. In IMail Administrator, select "localhost" in the left panel.
2. Select the "Services" folder and click on POP3. The POP3 tab appears .
   
3. Enter the options you want to use to configure the POP3 server.

   Each option is described below.

4. Click Apply to save your changes.
5. After making changes, stop the service, wait 5-10 seconds and restart the service. Any changes that you make are saved automatically as soon as you press the Stop/Start button.

Logging Options

In the Log To box, select the way you want to log POP3 events:

• sysMMDD.TXT. This sends event information to a file of this name where MM is the month and DD is the day the log was written. This file is stored in the Spool directory.
• No Log. Select this to turn off the logging of events.
• App Log. This sends event information to the Windows NT Application Log (viewed with the Windows NT Event Viewer.)
• Log Server. This sends event information to the Log Server file indicated on the Log Files tab.

Other Options

Debug Messages. When selected, debug messages are written to the log file. This option is very resource intensive if you debug messages in IMAP4.

APOP. Turn this on for secure user authorization (password encryption). For more information, see RFC 1939.

Note: APOP only works using the IMail Server database; APOP does not work with an NT database.

Enable XTND XMIT command. When selected, the server accepts outbound mail sent via XTND XMIT. (Clients such as WinQVT/Net require this functionality.)

Allow remote password changes. Certain older mail clients have the ability to use the POP3 protocol to change passwords remotely. This check box is provided for system administrators whose end-users may be using those older applications. (These applications include older version of Eudora)

Auto-deny possible hack attempts. When selected, if more than 512 characters are sent during anything but the SMTP DATA command, the remote IP address is temporarily put in the "deny access" (Control Access) file until you stop and restart the service and then disconnects. Sending more than 512 characters in a command other than the SMTP DATA command would look like an attempt to "hack" into your server. You will not see the address in the "deny access" list, but it is reported in the log file.

Server Status. A status message shows whether or not the
service is running.

Start/Stop Service. This button toggles between Start and Stop depending on whether the service is running.

Advanced Options

When logging on to POP3, the service returns a welcome message that identifies the mail server version, vendor and operating system. Changing the message may help protect your server from spammer or hacker attacks. Previously, this setting was available only through the registry, but now you can edit it directly from IMail Administrator. You can use the POP3 Advanced tab to change the service welcome message, if for example, you wanted to hide the mail server version and vendor information.

To change the Welcome Message for POP3:

Enter the text you want to be displayed in the POP3 service welcome message. The text is limited to 400 characters. If over 400 characters are entered, the default message is used. When APOP is enabled, if the message plus the timestamp exceed 400 characters, the message will be truncated.

Setting Access to the POP3 Server

You can specify an IP address or set of IP addresses that are either granted access to the POP3 server or denied access. Computers that do not have access to the POP3 server computer will not be allowed to create a connection.

To deny access to a specific computer or group of computers:

1. Click the Control access button. The "Access Control" dialog box appears.
2. Select the Granted Access option.
3. Click the Add button. The "Deny Access On" dialog box
   is displayed.
4. In the IP Address box, enter the IP address of the computer to be denied access to the POP3 server.

   To deny access to a group of computers, select the Group of Computers option. In the IP Address and Subnet Mask boxes, enter the IP address and subnet mask for the group to be
   denied access. For example, if you have a class C address
   space of 156.21.50.0, enter a group address of 156.21.50.0
   and a subnet mask of 255.255.255.0. This will deny access to those 254 computers.

5. Click OK to add the IP address(es) to the list.

   Access will be granted to all computers except those listed.

6. Click Apply to save the changes. Note that you must stop and restart the service for the changes to take affect.

To grant access to a specific computer or group of computers:

1. Click the Control access button. The "Access Control"
   dialog box appears.
2. Select the Denied Access option.
3. Click the Add button. The "Grant Access On" dialog
   box appears.
4. In the IP Address box, enter the IP address of the computer to be granted access to the POP3 server.

   To grant access to a group of computers, select the Group of Computers option. In the IP Address and Subnet Mask boxes, enter the IP address and subnet mask for the group to be
   granted access. For example, if you have a class C address
   space of 156.21.50.0, enter a group address of 156.21.50.0
   and a subnet mask of 255.255.255.0. This grants access to
   those 254 computers.

5. Click OK to add the IP address(es) to the list.

   Access will be denied to all computers except those listed.

6. Click Apply to save the changes. Note that you must stop and restart the service for the changes to take effect.

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