When a user wants to unsubscribe from the list-server mailing list, most list servers expect the Unsubscribe command to be specified in the body of the mail message. If you want the list-server mailing list to also accept an Unsubscribe command specified in the Subject line of the message, select this option.
When selected, the list-server mailing list will accept the following commands in the Subject line to unsubscribe:
Note: Passwords are case-sensitive and there must be no leading spaces after the password. See example below.
Example:
The following example assumes there is a list named beer that allows unsubscribes based on the Subject line on a mail host named domain.com.
To unsubscribe from the list:
TO: imailsrv@domain.com
Subject:[:password:]Unsubscribe beer