diff --git a/app/controllers/user_admin_controller.rb b/app/controllers/user_admin_controller.rb
--- a/app/controllers/user_admin_controller.rb
+++ b/app/controllers/user_admin_controller.rb
@@ -129,12 +129,33 @@
       ustat = Array.new
       ustat[0] = u
       @problems.each do |p|
-	sub = Submission.find_last_by_user_and_problem(u.id,p.id)
-	if (sub!=nil) and (sub.points!=nil) 
-	  ustat << [(sub.points.to_f*100/p.full_score).round, (sub.points>=p.full_score)]
-	else
-	  ustat << [0,false]
-	end
+        sub = Submission.find_last_by_user_and_problem(u.id,p.id)
+        if (sub!=nil) and (sub.points!=nil) 
+          ustat << [(sub.points.to_f*100/p.full_score).round, (sub.points>=p.full_score)]
+        else
+          ustat << [0,false]
+        end
+      end
+      @scorearray << ustat
+    end
+  end
+
+  def user_stat_max
+    @problems = Problem.find_available_problems
+    @users = User.find(:all, :include => [:contests, :contest_stat])
+    @scorearray = Array.new
+    #set up range from param
+    since_id = params.fetch(:since_id, 0).to_i
+    until_id = params.fetch(:until_id, 0).to_i
+    @users.each do |u|
+      ustat = Array.new
+      ustat[0] = u
+      @problems.each do |p|
+        max_points = 0
+        Submission.find_in_range_by_user_and_problem(u.id,p.id,since_id,until_id).each do |sub|
+          max_points = sub.points if sub and sub.points and (sub.points > max_points)
+        end
+        ustat << [(max_points.to_f*100/p.full_score).round, (max_points>=p.full_score)]
       end
       @scorearray << ustat
     end
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -129,7 +129,7 @@
                     :login => user.login,
                     :password => user.password,
                     :activation_url => activation_url,
-                    :admin_email => admin_email
+                    :admin_email => GraderConfiguration['system.admin_email']
                   })
 
     logger.info mail_body
@@ -145,7 +145,7 @@
                     :contest_name => contest_name,
                     :login => user.login,
                     :password => user.password,
-                    :admin_email => admin_email
+                    :admin_email => GraderConfiguration['system.admin_email']
                   })
 
     logger.info mail_body
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -113,7 +113,7 @@
 <tr>
 <td class="left-col">
 #{user.full_name}<br/>
-#{t 'title_bar.current_time'} #{format_short_time(Time.new)}
+#{t 'title_bar.current_time'} #{format_short_time(Time.zone.now)}
 #{time_left}
 <br/>
 </td>
diff --git a/app/models/submission.rb b/app/models/submission.rb
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -34,6 +34,13 @@
                            "ORDER BY user_id")
   end
 
+  def self.find_in_range_by_user_and_problem(user_id, problem_id,since_id,until_id)
+    records = Submission.where(problem_id: problem_id,user_id: user_id)
+    records = records.where('id >= ?',since_id) if since_id > 0
+    records = records.where('id <= ?',until_id) if until_id > 0
+    records.all
+  end
+
   def self.find_last_for_all_available_problems(user_id)
     submissions = Array.new
     problems = Problem.find_available_problems
diff --git a/app/views/user_admin/_submission_range.html.haml b/app/views/user_admin/_submission_range.html.haml
new file mode 100644
--- /dev/null
+++ b/app/views/user_admin/_submission_range.html.haml
@@ -0,0 +1,18 @@
+
+
+= form_tag({action: :user_stat_max })  do
+  .submitbox
+    %table
+      %tr
+        %td{colspan: 6, style: 'font-weight: bold'} Query maximum score in submission range
+      %tr
+        %td{style: 'width: 120px; font-weight: bold'} Submission ID:
+        %td{align: 'right'} From:
+        %td= text_field_tag 'since_id', params[:since_id], style: 'width:40px'
+        %td To:
+        %td= text_field_tag 'until_id', params[:until_id], style: 'width:40px'
+        %td= submit_tag 'query'
+      %tr
+        %td 
+        %td{colspan: 5} Leave blank for uncondition
+
diff --git a/app/views/user_admin/user_stat.html.erb b/app/views/user_admin/user_stat.html.erb
--- a/app/views/user_admin/user_stat.html.erb
+++ b/app/views/user_admin/user_stat.html.erb
@@ -1,4 +1,9 @@
 <h1>User grading results</h1>
+<h2>Show scores from latest submission</h2>
+
+<%= render 'submission_range' %>
+
+<p>Latest scores</p>
 
 <table class="info">
 <tr class="info-head">
diff --git a/app/views/user_admin/user_stat_max.html.haml b/app/views/user_admin/user_stat_max.html.haml
new file mode 100644
--- /dev/null
+++ b/app/views/user_admin/user_stat_max.html.haml
@@ -0,0 +1,44 @@
+%h1 User grading results
+%h2 Show max scores in submission range
+
+- if @problem and @problem.errors
+  =error_messages_for 'problem'
+
+= render partial: 'submission_range'
+
+- if @log
+  %h3 Import log
+  %pre.import-log
+    = @log
+
+%p= link_to '[Show only latest submissions]', controller: :user_admin, action: :user_stat
+
+%table.info
+  %thead
+    %tr.info-head
+      %th User
+      %th Name
+      %th Activated?
+      %th Logged in
+      %th Contest(s)
+      - @problems.each do |p|
+        %th= p.name
+      %th Total
+      %th Passed
+  %tbody
+    - @scorearray.each do |sc|
+      %tr{class: cycle('info-even','info-odd')}
+        - total,num_passed = 0,0
+        - sc.each_index do |i|
+          - if i == 0
+            %td= sc[i].login
+            %td= sc[i].full_name
+            %td= sc[i].activated
+            %td= sc[i].try(:contest_stat).try(:started_at)!=nil ? 'yes' : 'no'
+            %td= sc[i].contests.collect {|c| c.name}.join(', ') 
+          - else
+            %td= sc[i][0]
+            - total += sc[i][0]
+            - num_passed += 1 if sc[i][1]
+        %td= total 
+        %td= num_passed
diff --git a/lib/mail_helper_methods.rb b/lib/mail_helper_methods.rb
--- a/lib/mail_helper_methods.rb
+++ b/lib/mail_helper_methods.rb
@@ -22,7 +22,18 @@
       body mail_body
     end
 
-    mail.delivery_settings = { :address => smtp_server }
+    mail_option = {
+      :address => smtp_server,
+#      :domain => nil,
+#      :port => 25,
+#      :user_name => nil,
+#      :password => nil,
+#      :authentication=>'plain',
+#      :enable_starttls_auto => true
+    }
+
+    mail.delivery_method :smtp, mail_option
+
     mail.deliver
   end