Added several missing command-line specifiers available.

ctrl/mailproc.ini

@@ -41,6 +41,13 @@
 ;     %l recipient list path/filename
 ;     %e processing error path/filename (put error text in this file)
 ;
+;     %h sender's host name
+;     %i sender's IP address
+;     %s sender's name (portion of e-mail address)
+;     %a sender's address (portion of e-mail address)
+;     %u sender's user number (0 if unauthenticated)
+;     %r reverse path (of SMTP "envelope")
+;
 ;     %! exec dir
 ;     %g temp dir
 ;     %j data dir