http://sourceforge.net/p/qmailadmin/patches/28/
Add a call to cracklib to enforce strong passwords.
Requires some combination of aclocal/automake/autoconf
to create a new configure file. Applies cleanly to
1.2.9 or earlier.

Index: user.c
===================================================================
--- user.c	(revision 7)
+++ user.c	(revision 10)
@@ -37,6 +37,9 @@
 #include "qmailadminx.h"
 #include "vpopmail.h"
 #include "vauth.h"
+#ifdef CRACKLIB
+#	include <crack.h>
+#endif
 
 
 #define HOOKS 1
@@ -762,6 +765,14 @@
       vclose();
       exit(0);
     }
+#ifdef CRACKLIB
+    if ((tmpstr = FascistCheck(Password1, CRACKLIB)) != NULL ) {
+	sprintf(StatusMessage, "Bad password - %s\n", tmpstr);
+	moduser();
+	vclose();
+	exit(0);
+    }
+#endif
     ret_code = vpasswd( ActionUser, Domain, Password1, USE_POP);
     if ( ret_code != VA_SUCCESS ) {
       sprintf(StatusMessage, "%s (%s)", get_html_text("140"), 
Index: configure.in
===================================================================
--- configure.in	(revision 7)
+++ configure.in	(revision 10)
@@ -27,6 +27,7 @@
 dnl Checks for libraries.
 AC_CHECK_LIB(crypt,crypt)
 AC_CHECK_LIB(shadow,crypt)
+AC_CHECK_LIB(crack,FascistCheck)
 #AC_CHECK_LIB(m,floor)
 #AC_CHECK_LIB(nsl, gethostbyaddr)
 #AC_CHECK_LIB(socket, getsockname)
@@ -370,6 +371,31 @@
 AC_DEFINE_UNQUOTED(SPAM_COMMAND, "$spam_command","")
 AC_SUBST(SPAM_COMMAND)
 
+cracklib=no
+AC_ARG_ENABLE(cracklib, [  --enable-cracklib=PATH     Path to cracklib dictionary.],
+    cracklib="$enableval",
+    [
+        if test "$cracklib" = ""
+        then
+            AC_MSG_ERROR([Unable to find your cracklib directory, specify --enable-cracklib.])
+        fi
+    ] )
+
+if test "$cracklib" = "yes"
+then
+	cracklib="/usr/lib/cracklib_dict"
+fi
+
+case $cracklib in
+0*|n*|N*)
+	echo "checking whether to use password checking... no"
+	;;
+*)
+	AC_DEFINE_UNQUOTED(CRACKLIB,"$cracklib","")
+	echo "checking whether to use password checking... yes"
+	;;
+esac
+
 HELP=no
 AC_ARG_ENABLE(help, [  --enable-help  Display help links on login page.],
     HELP="$enableval",)
@@ -432,4 +458,7 @@
 then
         echo "      spam command = "$spam_command""
 fi
-
+if test "$cracklib" != "no"
+then
+	echo "cracklib dictionary= "$cracklib""
+fi