请教：关于sendmail修改域名的问题

starndawn

使用# sendmail -d0 < /dev/null得出：

[root@wangliang mail]# sendmail -d0 < /dev/null
Version 8.14.2
Compiled with: DNSMAP LOG MATCHGECOS MILTER MIME7TO8 MIME8TO7
                NAMED_BIND NETINET NETUNIX NEWDB PH_MAP PIPELINING SASLv2 SCANF
                STARTTLS USERDB XDEBUG

============ SYSTEM IDENTITY (after readcf) ============
      (short domain name) $w = localhost
  (canonical domain name) $j = localhost.localdomain
         (subdomain name) $m = localdomain
              (node name) $k = test
========================================================

Recipient names must be specified

如果想修改$w，$j，$m怎么修改？谢谢！