Examples of header rewrite rules

The following examples show how the header rewriting rules affect an SMTP mail header. The example site is not a secure gateway and is configured as follows:

   TCPHostName      = mvs1.acme.com
   ShortTCPHostName = mvs1
   AltTCPHostName   = seeds.acme.com
   NJEHostName     = mvs1
   NJEDomain       = acmenet
   AltNJEDomain    = centralnet

Note that the above keywords are configured according to the definitions found in Predefined keywords within the SMTP rules (for example, from TCPIP.DATA). In addition, assume that the following hosts are known to be other NJE hosts:

   bird
   iron

Then the following header:

   From: abc@mvs1 (Brendan Beeper)
   To: Jenny Bird <def@bird>
   Cc: ghi@iron.acmenet, j@mvs1,
    k@seeds.acme.com,
    Mailing List <owner@acmenet>,
    lmno@iron.centralnet
   Subject: New Ore
 

is rewritten by the default header rewriting rules as:

   From: abc@mvs1.acme.com (Brendan Beeper)
   To: Jenny Bird <def%bird.acmenet@mvs1.acme.com>
   Cc: ghi%iron.acmenet@mvs1.acme.com, j@mvs1.acme.com,
    k@mvs1.acme.com,
    Mailing List <owner%acmenet@mvs.acme.com>,
    lmno%iron.acmenet@mvs1.acme.com
   Subject: New Ore
  

The next example deviates from the defaults listed in Default SMTP rules. On the configuration for nonsecure gateways, if you change the rule before the 2 ENDIFs to:

   A '@' AnyNJEHostName '.' AltNJEDomain =>
      '<@' TCPHostName ':' A '@' AnyNJEHostName '.' NJEDomain '>';

then the last address in the Cc: field within our header is rewritten as:

   Cc: <@mvs1.acme.com:lmno@iron.acmenet>