POP3 - General Settings

• Use APOP. Select the check box to secure user authorization (password encryption). For more information, see RFC 1939.

  Note: APOP works with the IMail user database only.

• Disable Plain Text Authentication. Select the check box to not allow users to authenticate using Plain Text or Base64 Encoded text authentication mechanisms. When this option is selected the authentication mechanisms listed below will not be advertised or supported before TLS Negotiation has occurred or the user connects on the services' SSL Port.

Plain Text Authentication Commands	Base64 Encoded Authentication Commands
USER + PASS	SASL LOGIN SASL PLAIN

• Enable XTND XMIT Command. Select the check box to enable the IMail Server to accept outbound mail sent via XTND XMIT. Clients such as WinQVT/Net require this functionality.
• Allow Remote Password Change. Select the check box to enable internal commands that allow remote password changes with older mail clients (such as an older version of Eudora).
• Auto Deny Possible Hack Attempts. Select the check box to enable a remote IP address to be temporarily denied access (Control Access file).

  Note: If more than 512 characters are sent in a POP3 command (other than the POP3 DATA command) the remote IP address is temporarily put in the Control Access file until you stop and restart the IMail service. This data appears to the IMail Server as an attempt to hack into the server. The IP address is not displayed in the Control Access list, but it is reported in the log file.