10.9.2.1 General Reverse Mapping Example

An example of a general REVERSE Mapping is as follows: suppose that the internal addresses at siroe.com are of the form user@mailhost.siroe.com. However, the user name space is such that user@host1.siroe.com and user@host2.siroe.com specify the same person for all hosts at siroe.com. The following REVERSE mapping may be used in conjunction with the address-reversal text database:

REVERSE

   *@*.siroe.com        $0@siroe.com$Y$D
            

In this example, addresses of the form name@anyhost.siroe.com would be changed to name@siroe.com. The $D metacharacter causes the address-reversal database to be consulted. The address-reversal text database should contain entries of the form:

user@mailhost.siroe.com     first.last@siroe.com