Rewrite subdomain single field substitutions

Rewrite subdomain single field substitutions,, ,  ,
Subdomain single field substitutions extract a single subdomain part from the host/domain specification being rewritten. The available single field substitutions are shown in  Single field substitutions.

Suppose the address jdoe@msgstore.domain.com matches the rewrite rule &#x2a;.DOMAIN.COM    $U%$&0.domain.com@mailhub.domain.com Then the result from the template will be jdoe@msgstore.domain.com with mailhub.domain.com used as the routing system.

See also:
 * Rewrite rule template substitutions and control sequences