Send confirmation instructions only works if the record is not confirmed.

lib/devise/models/confirmable.rb

@@ -59,9 +59,11 @@ module Devise
       # confirming it's account
       #
       def reset_confirmation!
-        reset_confirmation
-        reset_perishable_token!
-        send_confirmation_instructions
+        unless_confirmed do
+          reset_confirmation
+          reset_perishable_token!
+          send_confirmation_instructions
+        end
       end
 
       private

test/integration/confirmable_test.rb

@@ -3,7 +3,7 @@ require 'test/test_helper'
 class UsersConfirmationTest < ActionController::IntegrationTest
 
   test 'user should be able to request a new confirmation' do
-    user = create_user
+    user = create_user(:confirm => false)
     ActionMailer::Base.deliveries.clear
 
     visit new_user_session_path

test/models/confirmable_test.rb

@@ -112,8 +112,6 @@ class ConfirmableTest < ActiveSupport::TestCase
   test 'should reset confirmation status when sending the confirmation instructions' do
     user = create_user
     assert_not user.confirmed?
-    user.confirm!
-    assert user.confirmed?
     confirmation_user = User.send_confirmation_instructions(:email => user.email)
     assert_not user.reload.confirmed?
   end
@@ -150,4 +148,13 @@ class ConfirmableTest < ActiveSupport::TestCase
     user.save!
     assert_not user.reload.confirmed?
   end
+
+  test 'should not be able to send instructions if the user is already confirmed' do
+    user = create_user
+    user.confirm!
+    assert_not user.reset_confirmation!
+    assert user.confirmed?
+    assert user.errors[:email].present?
+    assert_equal 'already confirmed', user.errors[:email]
+  end
 end