diff --git a/app/assets/stylesheets/request-for-comments.css.scss b/app/assets/stylesheets/request-for-comments.css.scss
index e0ff5fa0..8fb7bfea 100644
--- a/app/assets/stylesheets/request-for-comments.css.scss
+++ b/app/assets/stylesheets/request-for-comments.css.scss
@@ -127,11 +127,11 @@
       }
     }
   }
+}
 
-  input#subscribe {
-    margin-top: 5px;
-    margin-right: 5px;
-  }
+input#subscribe {
+  margin-top: 5px;
+  margin-right: 5px;
 }
 
 #myComment {
diff --git a/app/controllers/comments_controller.rb b/app/controllers/comments_controller.rb
index 948f3e5b..d292804e 100644
--- a/app/controllers/comments_controller.rb
+++ b/app/controllers/comments_controller.rb
@@ -121,13 +121,16 @@ class CommentsController < ApplicationController
 
   def send_mail_to_subscribers(comment, request_for_comment)
     request_for_comment.commenters.each do |commenter|
+      already_sent_mail = false
       subscriptions = Subscription.where(
           :request_for_comment_id => request_for_comment.id,
-          :user_id => commenter.id, :user_type => commenter.class.name)
+          :user_id => commenter.id, :user_type => commenter.class.name,
+          :deleted => false)
       subscriptions.each do |subscription|
         if (subscription.subscription_type == 'author' and current_user == request_for_comment.user) or subscription.subscription_type == 'all'
-          if subscription.user != current_user
+          unless subscription.user == current_user or already_sent_mail
             UserMailer.got_new_comment_for_subscription(comment, subscription, current_user).deliver_now
+            already_sent_mail = true
           end
         end
       end
diff --git a/app/controllers/subscriptions_controller.rb b/app/controllers/subscriptions_controller.rb
index 21321caf..232e9f01 100644
--- a/app/controllers/subscriptions_controller.rb
+++ b/app/controllers/subscriptions_controller.rb
@@ -32,7 +32,8 @@ class SubscriptionsController < ApplicationController
     else
       authorize!
       rfc = @subscription.try(:request_for_comment)
-      if @subscription.destroy
+      @subscription.deleted = true
+      if @subscription.save
         respond_to do |format|
           format.html { redirect_to request_for_comment_url(rfc), notice: t('subscriptions.successfully_unsubscribed') }
           format.json { render json: {message: t('subscriptions.successfully_unsubscribed')}, status: :ok}
@@ -55,7 +56,7 @@ class SubscriptionsController < ApplicationController
   def subscription_params
     current_user_id = current_user.try(:id)
     current_user_class_name = current_user.try(:class).try(:name)
-    params[:subscription].permit(:request_for_comment_id, :subscription_type).merge(user_id: current_user_id, user_type: current_user_class_name)
+    params[:subscription].permit(:request_for_comment_id, :subscription_type).merge(user_id: current_user_id, user_type: current_user_class_name, deleted: false)
   end
   private :subscription_params
 end
diff --git a/app/views/exercises/_comment_dialogcontent.html.slim b/app/views/exercises/_comment_dialogcontent.html.slim
index 29fb8208..ab6dc6b4 100644
--- a/app/views/exercises/_comment_dialogcontent.html.slim
+++ b/app/views/exercises/_comment_dialogcontent.html.slim
@@ -1,9 +1,10 @@
 #otherComments
   h5 =t('exercises.implement.comment.others')
   .container
-  label
-    input#subscribe type='checkbox' title=t('request_for_comments.subscribe_to_author') data-subscription=Subscription.where(user: current_user, request_for_comment_id: @request_for_comment.id).try(:first).try(:id)
-    = t('request_for_comments.subscribe_to_author')
+
+label
+  input#subscribe type='checkbox' title=t('request_for_comments.subscribe_to_author') data-subscription=Subscription.where(user: current_user, request_for_comment_id: @request_for_comment.id, subscription_type: 'author', deleted: false).try(:first).try(:id)
+  = t('request_for_comments.subscribe_to_author')
 
 #myComment
   h5 =t('exercises.implement.comment.addyours')
diff --git a/db/migrate/20170920145852_add_deleted_to_subscription.rb b/db/migrate/20170920145852_add_deleted_to_subscription.rb
new file mode 100644
index 00000000..eb1d47c4
--- /dev/null
+++ b/db/migrate/20170920145852_add_deleted_to_subscription.rb
@@ -0,0 +1,5 @@
+class AddDeletedToSubscription < ActiveRecord::Migration
+  def change
+    add_column :subscriptions, :deleted, :boolean
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index c31baf1c..e7e0c6d6 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170913054203) do
+ActiveRecord::Schema.define(version: 20170920145852) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -288,6 +288,7 @@ ActiveRecord::Schema.define(version: 20170913054203) do
     t.string   "subscription_type"
     t.datetime "created_at",             null: false
     t.datetime "updated_at",             null: false
+    t.boolean  "deleted"
   end
 
   create_table "tags", force: :cascade do |t|