--- a/scmail/config.scm
+++ b/scmail/config.scm
@@ -30,6 +30,8 @@
 	  ))
 (select-module scmail.config)
 
+(autoload scmail.util scmail-eformat)
+
 (define scmail-config-directory (make-parameter (expand-path "~/.scmail")))
 
 (define (scmail-config-set-directory! directory)
--- a/scmail/mailbox.scm
+++ b/scmail/mailbox.scm
@@ -19,6 +19,7 @@
   (use srfi-1)
   (use file.util)
   (use gauche.parameter)
+  (use scmail.util)
   (export <mailbox>
           make-scmail-mailbox
           scmail-mailbox-mail-list
--- a/scmail/util.scm
+++ b/scmail/util.scm
@@ -19,7 +19,6 @@
   (use file.util)
   (use srfi-13)
   (use gauche.parameter)
-  (use scmail.config)
   (use scmail.progress)
   (use gauche.version)
   (export filter safe-rxmatch 
@@ -31,6 +30,8 @@
 
 (select-module scmail.util)
 
+(autoload scmail.config scmail-config-verbose-mode?)
+
 ;;
 ;; FIXME: Reinvent it because filter in srfi-1 module is too
 ;; slow in old Gauche implementations.
--- a/scmail.scm
+++ b/scmail.scm
@@ -264,7 +264,7 @@
               (unless (eq? status :last)
                       (scmail-filter-iter mail (cdr filter-rules))))))
   (unless (is-a? mail <mail>)
-          (scmail-eprintf "<mail> required but got ~a" (class-of mail)))
+          (scmail-eformat "<mail> required but got ~a" (class-of mail)))
   (scmail-filter-iter mail (filter-rules)))