SMTP secure gateway configuration defaults

If SMTP is configured as a secure gateway, SMTP uses the following defaults:

FIELD DEFINITION SECTION
DEFAULTFIELDS = 'BCC' 'CC' 'FROM' 'REPLY-TO' 'RESENT-FROM'
                'RESENT-REPLY-TO' 'RESENT-SENDER' 'RETURN-PATH'
                'SENDER' 'TO';

RULE DEFINITION SECTION

SECURENICKADDR    => SECURENICKNAME '@' TCPHOSTNAME;
A '@' NJEHOSTNAME => A '@' TCPHOSTNAME;

IF NJEDOMAIN NOT = '' THEN
   SECURENICKADDR '.' NJEDOMAIN    => SECURENICKNAME '@' TCPHOSTNAME;
   SECURENICKADDR '.' ALTNJEDOMAIN => SECURENICKNAME '@' TCPHOSTNAME;
   A '@' NJEHOSTNAME '.' NJEDOMAIN    => A '@' TCPHOSTNAME;
   A '@' NJEHOSTNAME '.' ALTNJEDOMAIN => A '@' TCPHOSTNAME;
   IF NJEDOMAIN CONTAINS '.' THEN
      A '@' ANYNJEHOSTNAME                  =>
         A '@' ANYNJEHOSTNAME '.' NJEDOMAIN;
      A '@' ANYNJEHOSTNAME '.' NJEDOMAIN    =>
         A '@' ANYNJEHOSTNAME '.' NJEDOMAIN;
      A '@' ANYNJEHOSTNAME '.' ALTNJEDOMAIN =>
         A '@' ANYNJEHOSTNAME '.' NJEDOMAIN;
    ELSE
       A '@' ANYNJEHOSTNAME                  =>
          A '%' ANYNJEHOSTNAME '.' NJEDOMAIN '@' TCPHOSTNAME;
       A '@' ANYNJEHOSTNAME '.' NJEDOMAIN    =>
          A '%' ANYNJEHOSTNAME '.' NJEDOMAIN '@' TCPHOSTNAME;
       A '@' ANYNJEHOSTNAME '.' ALTNJEDOMAIN =>
          A '%' ANYNJEHOSTNAME '.' NJEDOMAIN '@' TCPHOSTNAME;
    ENDIF
 ENDIF
 A '@' TCPHOSTNAME       => A '@' TCPHOSTNAME;
 A '@' SHORTTCPHOSTTNAME => A '@' TCPHOSTNAME;
 A '@' ALTTCPHOSTNAME    => A '@' TCPHOSTNAME;
 A '@' ANYDOMAINNAME     => A '@' ANYDOMAINNAME;
 A '@' B                 => A '@' B '.' TCPHOSTNAMEDOMAIN;