diff --git a/app/models/registration.rb b/app/models/registration.rb
index ddfbca22..56392783 100644
--- a/app/models/registration.rb
+++ b/app/models/registration.rb
@@ -172,7 +172,11 @@ def update_payment_lane(id, iso_amount, currency_iso, status)
   end
 
   def update_waiting_list(update_params, waiting_list)
-    raise ArgumentError.new('Can only accept waiting list leader') if update_params[:status] == 'accepted' && waiting_list_position(waiting_list) != 1
+    if update_params[:status] == 'accepted' && waiting_list_position(waiting_list) != 1
+      EmailApi.send_waiting_list_leader_email(
+        self.competition_id, self.user_id, waiting_list_position(waiting_list)
+      )
+    end
 
     waiting_list.add(self.user_id) if update_params[:status] == 'waiting_list'
     waiting_list.remove(self.user_id) if update_params[:status] == 'accepted'
@@ -180,6 +184,7 @@ def update_waiting_list(update_params, waiting_list)
     waiting_list.move_to_position(self.user_id, update_params[:waiting_list_position].to_i) if
       update_params[:waiting_list_position].present?
   end
+
   # Fields
   field :user_id, :integer
   field :guests, :integer
@@ -187,6 +192,7 @@ def update_waiting_list(update_params, waiting_list)
   field :competing_status, :string
   field :hide_name_publicly, :boolean
   field :lanes, :array, of: Lane
+
   # We only do this one way because Dynamoid doesn't allow us to overwrite the foreign_key for has_one see https://github.com/Dynamoid/dynamoid/issues/740
   belongs_to :history, class: RegistrationHistory, foreign_key: :attendee_id
 
diff --git a/lib/email_api.rb b/lib/email_api.rb
index 50fa8090..5858d57e 100644
--- a/lib/email_api.rb
+++ b/lib/email_api.rb
@@ -8,6 +8,10 @@ def self.registration_email_path
     "#{EnvConfig.WCA_HOST}/api/internal/v1/mailers/registration"
   end
 
+  def self.waiting_list_leader_path
+    "#{EnvConfig.WCA_HOST}/api/internal/v1/mailers/waiting-list-leader"
+  end
+
   def self.send_update_email(competition_id, user_id, status, current_user)
     HTTParty.post(EmailApi.registration_email_path, headers: { WCA_API_HEADER => self.wca_token }, body: {
                     competition_id: competition_id,
@@ -27,4 +31,12 @@ def self.send_creation_email(competition_id, user_id)
                     current_user: user_id,
                   })
   end
+
+  def self.send_waiting_list_leader_email(competition_id, user_id, position)
+    HTTParty.post(EmailApi.waiting_list_leader_path, headers: { WCA_API_HEADER => self.wca_token }, body: {
+                    competition_id: competition_id,
+                    user_id: user_id,
+                    position: position,
+                  })
+  end
 end
diff --git a/spec/controllers/registration_controller_spec.rb b/spec/controllers/registration_controller_spec.rb
index 5c3dfb3b..aa3d3e17 100644
--- a/spec/controllers/registration_controller_spec.rb
+++ b/spec/controllers/registration_controller_spec.rb
@@ -265,7 +265,7 @@
     end
   end
 
-  describe '#list_admin', :tag do
+  describe '#list_admin' do
     before do
       @competition = FactoryBot.build(:competition)
       stub_json(CompetitionApi.url(@competition['id']), 200, @competition.except('qualifications'))
diff --git a/spec/models/registration_spec.rb b/spec/models/registration_spec.rb
index 18de5608..21484930 100644
--- a/spec/models/registration_spec.rb
+++ b/spec/models/registration_spec.rb
@@ -84,10 +84,16 @@
         expect(@waiting_list.entries.include?(@reg1.user_id)).to eq(false)
       end
 
-      it 'cant accept if not in leading position of waiting list' do
-        expect {
-          @reg2.update_competing_lane!({ status: 'accepted' }, @waiting_list)
-        }.to raise_error(ArgumentError, 'Can only accept waiting list leader')
+      it 'can accept if not in leading position of waiting list' do
+        stub_request(:post, EmailApi.waiting_list_leader_path).to_return(status: 200, body: { emails_sent: 1 }.to_json)
+
+        @reg2.update_competing_lane!({ status: 'accepted' }, @waiting_list)
+        @waiting_list.reload
+
+        expect(@reg2.competing_status).to eq('accepted')
+        expect(@reg1.waiting_list_position(@waiting_list)).to eq(1)
+        expect(@waiting_list.entries.include?(@reg2.user_id)).to eq(false)
+        expect(WebMock).to have_requested(:post, EmailApi.waiting_list_leader_path)
       end
     end