diff --git a/app/controllers/blocks_controller.rb b/app/controllers/blocks_controller.rb
index a9bcae865..7256a38c8 100644
--- a/app/controllers/blocks_controller.rb
+++ b/app/controllers/blocks_controller.rb
@@ -6,7 +6,7 @@ class BlocksController < ApplicationController
   def create
     block = current_user.blocks.new(block_params)
 
-    disconnect_if_contact(block.person) if block.save
+    send_message(block) if block.save
 
     respond_to do |format|
       format.json { head :no_content }
@@ -14,7 +14,9 @@ class BlocksController < ApplicationController
   end
 
   def destroy
-    notice = if current_user.blocks.find_by(id: params[:id])&.delete
+    block = current_user.blocks.find_by(id: params[:id])
+    notice = if block&.delete
+               ContactRetraction.for(block).defer_dispatch(current_user)
                {notice: t("blocks.destroy.success")}
              else
                {error: t("blocks.destroy.failure")}
@@ -28,8 +30,14 @@ class BlocksController < ApplicationController
 
   private
 
-  def disconnect_if_contact(person)
-    current_user.contact_for(person).try {|contact| current_user.disconnect(contact) }
+  def send_message(block)
+    contact = current_user.contact_for(block.person)
+
+    if contact
+      current_user.disconnect(contact)
+    elsif block.person.remote?
+      Diaspora::Federation::Dispatcher.defer_dispatch(current_user, block)
+    end
   end
 
   def block_params
diff --git a/app/models/block.rb b/app/models/block.rb
index f0e79b22b..147361cac 100644
--- a/app/models/block.rb
+++ b/app/models/block.rb
@@ -15,4 +15,9 @@ class Block < ApplicationRecord
       errors[:person_id] << "stop blocking yourself!"
     end
   end
+
+  # @return [Array<Person>] The recipient of the block
+  def subscribers
+    [person]
+  end
 end
diff --git a/lib/diaspora/federated/contact_retraction.rb b/lib/diaspora/federated/contact_retraction.rb
index 57efd2f45..69ec85f7f 100644
--- a/lib/diaspora/federated/contact_retraction.rb
+++ b/lib/diaspora/federated/contact_retraction.rb
@@ -6,11 +6,11 @@ class ContactRetraction < Retraction
   end
 
   def self.retraction_data_for(target)
-    Diaspora::Federation::Entities.contact(target).to_h
+    Diaspora::Federation::Entities.build(target).to_h
   end
 
   def self.for(target)
-    target.receiving = false
+    target.receiving = false if target.is_a?(Contact)
     super
   end
 
diff --git a/lib/diaspora/federation/entities.rb b/lib/diaspora/federation/entities.rb
index e6dbff2a0..f8d8aa1a5 100644
--- a/lib/diaspora/federation/entities.rb
+++ b/lib/diaspora/federation/entities.rb
@@ -31,6 +31,16 @@ module Diaspora
         )
       end
 
+      def self.block(block)
+        DiasporaFederation::Entities::Contact.new(
+          author:    block.user.diaspora_handle,
+          recipient: block.person.diaspora_handle,
+          sharing:   false,
+          following: false,
+          blocking:  Block.exists?(user: block.user, person: block.person)
+        )
+      end
+
       def self.comment(comment)
         DiasporaFederation::Entities::Comment.new(
           {
@@ -52,7 +62,8 @@ module Diaspora
           author:    contact.user.diaspora_handle,
           recipient: contact.person.diaspora_handle,
           sharing:   contact.receiving,
-          following: contact.receiving
+          following: contact.receiving,
+          blocking:  Block.exists?(user: contact.user, person: contact.person)
         )
       end
 
diff --git a/lib/diaspora/federation/mappings.rb b/lib/diaspora/federation/mappings.rb
index 91ccefee6..ac10929c5 100644
--- a/lib/diaspora/federation/mappings.rb
+++ b/lib/diaspora/federation/mappings.rb
@@ -29,6 +29,7 @@ module Diaspora
         case diaspora_entity
         when AccountMigration  then :account_migration
         when AccountDeletion   then :account_deletion
+        when Block             then :block
         when Comment           then :comment
         when Contact           then :contact
         when Conversation      then :conversation
diff --git a/spec/controllers/blocks_controller_spec.rb b/spec/controllers/blocks_controller_spec.rb
index b3d7b1567..11acfdccb 100644
--- a/spec/controllers/blocks_controller_spec.rb
+++ b/spec/controllers/blocks_controller_spec.rb
@@ -17,8 +17,8 @@ describe BlocksController, :type => :controller do
       expect(response.status).to eq(204)
     end
 
-    it "calls #disconnect_if_contact" do
-      expect(@controller).to receive(:disconnect_if_contact).with(bob.person)
+    it "calls #send_message" do
+      expect(@controller).to receive(:send_message).with(an_instance_of(Block))
       post :create, params: {block: {person_id: bob.person.id}}, format: :json
     end
   end
@@ -38,6 +38,13 @@ describe BlocksController, :type => :controller do
       expect(flash[:notice]).to eq(I18n.t("blocks.destroy.success"))
     end
 
+    it "sends a message" do
+      retraction = double
+      expect(ContactRetraction).to receive(:for).with(@block).and_return(retraction)
+      expect(retraction).to receive(:defer_dispatch).with(alice)
+      delete :destroy, params: {id: @block.id}
+    end
+
     it "responds with 204 with json" do
       delete :destroy, params: {id: @block.id}, format: :json
       expect(response.status).to eq(204)
@@ -60,21 +67,32 @@ describe BlocksController, :type => :controller do
     end
   end
 
-  describe "#disconnect_if_contact" do
+  describe "#send_message" do
     before do
       allow(@controller).to receive(:current_user).and_return(alice)
     end
 
-    it "calls disconnect with the force option if there is a contact for a given user" do
+    it "calls disconnect if there is a contact for a given user" do
+      block = alice.blocks.create(person: bob.person)
       contact = alice.contact_for(bob.person)
-      allow(alice).to receive(:contact_for).and_return(contact)
+      expect(alice).to receive(:contact_for).and_return(contact)
       expect(alice).to receive(:disconnect).with(contact)
-      @controller.send(:disconnect_if_contact, bob.person)
+      expect(Diaspora::Federation::Dispatcher).not_to receive(:defer_dispatch)
+      @controller.send(:send_message, block)
     end
 
-    it "doesn't call disconnect if there is a contact for a given user" do
+    it "queues a message with the block if the person is remote and there is no contact for a given user" do
+      block = alice.blocks.create(person: remote_raphael)
       expect(alice).not_to receive(:disconnect)
-      @controller.send(:disconnect_if_contact, eve.person)
+      expect(Diaspora::Federation::Dispatcher).to receive(:defer_dispatch).with(alice, block)
+      @controller.send(:send_message, block)
+    end
+
+    it "does nothing if the person is local and there is no contact for a given user" do
+      block = alice.blocks.create(person: eve.person)
+      expect(alice).not_to receive(:disconnect)
+      expect(Diaspora::Federation::Dispatcher).not_to receive(:defer_dispatch)
+      @controller.send(:send_message, block)
     end
   end
 end
diff --git a/spec/lib/diaspora/federation/entities_spec.rb b/spec/lib/diaspora/federation/entities_spec.rb
index 0b80c1cc8..c0ab1aff8 100644
--- a/spec/lib/diaspora/federation/entities_spec.rb
+++ b/spec/lib/diaspora/federation/entities_spec.rb
@@ -56,6 +56,19 @@ describe Diaspora::Federation::Entities do
       expect(federation_entity.recipient).to eq(diaspora_entity.person.diaspora_handle)
       expect(federation_entity.sharing).to be_truthy
       expect(federation_entity.following).to be_truthy
+      expect(federation_entity.blocking).to be_falsey
+    end
+
+    it "builds a contact for a block" do
+      diaspora_entity = FactoryGirl.create(:block)
+      federation_entity = described_class.build(diaspora_entity)
+
+      expect(federation_entity).to be_instance_of(DiasporaFederation::Entities::Contact)
+      expect(federation_entity.author).to eq(diaspora_entity.user.diaspora_handle)
+      expect(federation_entity.recipient).to eq(diaspora_entity.person.diaspora_handle)
+      expect(federation_entity.sharing).to be_falsey
+      expect(federation_entity.following).to be_falsey
+      expect(federation_entity.blocking).to be_truthy
     end
 
     context "Conversation" do
@@ -237,6 +250,35 @@ describe Diaspora::Federation::Entities do
         expect(federation_entity.recipient).to eq(target.person.diaspora_handle)
         expect(federation_entity.sharing).to be_falsey
         expect(federation_entity.following).to be_falsey
+        expect(federation_entity.blocking).to be_falsey
+      end
+
+      it "builds a Contact for a Contact retraction with block" do
+        target = FactoryGirl.create(:contact, receiving: false)
+        FactoryGirl.create(:block, user: target.user, person: target.person)
+        retraction = ContactRetraction.for(target)
+        federation_entity = described_class.build(retraction)
+
+        expect(federation_entity).to be_instance_of(DiasporaFederation::Entities::Contact)
+        expect(federation_entity.author).to eq(target.user.diaspora_handle)
+        expect(federation_entity.recipient).to eq(target.person.diaspora_handle)
+        expect(federation_entity.sharing).to be_falsey
+        expect(federation_entity.following).to be_falsey
+        expect(federation_entity.blocking).to be_truthy
+      end
+
+      it "builds a Contact for a Block retraction" do
+        target = FactoryGirl.create(:block)
+        target.delete
+        retraction = ContactRetraction.for(target)
+        federation_entity = described_class.build(retraction)
+
+        expect(federation_entity).to be_instance_of(DiasporaFederation::Entities::Contact)
+        expect(federation_entity.author).to eq(target.user.diaspora_handle)
+        expect(federation_entity.recipient).to eq(target.person.diaspora_handle)
+        expect(federation_entity.sharing).to be_falsey
+        expect(federation_entity.following).to be_falsey
+        expect(federation_entity.blocking).to be_falsey
       end
     end
 
diff --git a/spec/models/block_spec.rb b/spec/models/block_spec.rb
index e3ee01c42..27f12848e 100644
--- a/spec/models/block_spec.rb
+++ b/spec/models/block_spec.rb
@@ -1,10 +1,17 @@
 # frozen_string_literal: true
 
-describe Block, :type => :model do
+describe Block, type: :model do
   describe "validations" do
     it "doesnt allow you to block yourself" do
       block = alice.blocks.create(person: alice.person)
       expect(block.errors[:person_id].size).to eq(1)
     end
   end
+
+  describe "#subscribers" do
+    it "returns an array with recipient of the block" do
+      block = alice.blocks.create(person: eve.person)
+      expect(block.subscribers).to match_array([eve.person])
+    end
+  end
 end