diff --git a/app/controllers/api/v1/proposals_controller.rb b/app/controllers/api/v1/proposals_controller.rb
index e4cf2f9..094937d 100644
--- a/app/controllers/api/v1/proposals_controller.rb
+++ b/app/controllers/api/v1/proposals_controller.rb
@@ -4,12 +4,12 @@ class ProposalsController < Api::V1::ApiController
       before_action :set_project, only: %i[create]
 
       def create
-        proposal = @project.proposals.new(proposal_params.except(:invitation_request_id))
-        proposal.portfoliorrr_proposal_id = proposal_params[:invitation_request_id]
+        @proposal = @project.proposals.new(proposal_params.except(:invitation_request_id))
+        @proposal.portfoliorrr_proposal_id = proposal_params[:invitation_request_id]
 
-        return render json: { data: { proposal_id: proposal.id } }, status: :created if proposal.save
+        return success_result if @proposal.save
 
-        render json: { errors: proposal.errors.full_messages }, status: :conflict
+        render json: { errors: @proposal.errors.full_messages }, status: :conflict
       end
 
       def update
@@ -23,6 +23,11 @@ def update
 
       private
 
+      def success_result
+        ProposalMailer.with(proposal: @proposal).notify_leader.deliver
+        render json: { data: { proposal_id: @proposal.id } }, status: :created
+      end
+
       def set_project
         @project = Project.find(proposal_params[:project_id])
       rescue ActiveRecord::RecordNotFound
diff --git a/app/mailers/proposal_mailer.rb b/app/mailers/proposal_mailer.rb
new file mode 100644
index 0000000..5837c1d
--- /dev/null
+++ b/app/mailers/proposal_mailer.rb
@@ -0,0 +1,11 @@
+class ProposalMailer < ApplicationMailer
+  default from: 'notification@colabora.com'
+
+  def notify_leader
+    @proposal = params[:proposal]
+    @project = @proposal.project
+    @leader = @project.user
+
+    mail to: @leader.email, subject: t('.subject')
+  end
+end
diff --git a/app/views/proposal_mailer/notify_leader.html.erb b/app/views/proposal_mailer/notify_leader.html.erb
new file mode 100644
index 0000000..475f51a
--- /dev/null
+++ b/app/views/proposal_mailer/notify_leader.html.erb
@@ -0,0 +1,10 @@
+<main>
+  <h1><%= t '.project_received_a_new_proposal', project_title: @project.title %> </h1>
+  
+  <p><%= t '.proposer', email: @proposal.email %></p>
+  <p><%= t '.message', message: @proposal.message %></p>
+  
+  <%= link_to t('.view_proposal'), 
+              project_portfoliorrr_profile_url(@project, @proposal.profile_id) %>
+</main>
+
diff --git a/config/locales/mailers/proposal_mailer.yml b/config/locales/mailers/proposal_mailer.yml
new file mode 100644
index 0000000..6e4fe47
--- /dev/null
+++ b/config/locales/mailers/proposal_mailer.yml
@@ -0,0 +1,8 @@
+pt-BR:
+ proposal_mailer:
+  notify_leader:
+    subject: Nova solicitação para seu projeto!
+    project_received_a_new_proposal: Seu projeto %{project_title} recebeu uma nova solicitação!
+    proposer: "Solicitante: %{email}"
+    message: "Mensagem: %{message}"
+    view_proposal: Visualizar solicitação
\ No newline at end of file
diff --git a/spec/mailers/proposal_mailer_spec.rb b/spec/mailers/proposal_mailer_spec.rb
new file mode 100644
index 0000000..6921851
--- /dev/null
+++ b/spec/mailers/proposal_mailer_spec.rb
@@ -0,0 +1,25 @@
+require 'rails_helper'
+
+RSpec.describe ProposalMailer, type: :mailer do
+  describe '#notify_leader' do
+    it 'envia email para o líder do projeto com sucesso' do
+      leader = create :user, email: 'leader@email.com'
+      project = create :project, user: leader,
+                                 title: 'Canal de Youtube'
+      proposal = create :proposal, project:,
+                                   message: 'Gostaria de participar',
+                                   email: 'proposer_portfoliorrr@email.com'
+
+      mail = ProposalMailer.with(proposal:).notify_leader
+
+      expect(mail.to).to include 'leader@email.com'
+      expect(mail.subject).to include 'Nova solicitação para seu projeto!'
+      expect(mail.body.encoded).to include 'Seu projeto Canal de Youtube recebeu uma nova solicitação!'
+      expect(mail.body.encoded).to include 'Solicitante: proposer_portfoliorrr@email.com'
+      expect(mail.body.encoded).to include 'Mensagem: Gostaria de participar'
+      link = project_portfoliorrr_profile_url project, proposal.profile_id
+      button = "<a href=\"#{link}\">Visualizar solicitação</a>"
+      expect(mail.body.encoded).to include button
+    end
+  end
+end
diff --git a/spec/requests/api/v1/proposals/proposal_creation_spec.rb b/spec/requests/api/v1/proposals/proposal_creation_spec.rb
index 3239aec..3ecf7ca 100644
--- a/spec/requests/api/v1/proposals/proposal_creation_spec.rb
+++ b/spec/requests/api/v1/proposals/proposal_creation_spec.rb
@@ -11,6 +11,10 @@
         message: 'Gostaria de participar!',
         email: 'proposer@email.com'
       } }
+      mail = double 'mail', deliver: true
+      mailer = double 'ProposalMailer'
+      allow(ProposalMailer).to receive(:with).and_return mailer
+      allow(mailer).to receive(:notify_leader).and_return mail
 
       post(api_v1_proposals_path, params:)
 
@@ -26,6 +30,7 @@
       expect(Proposal.last.message).to eq 'Gostaria de participar!'
       expect(Proposal.last.email).to eq 'proposer@email.com'
       expect(Proposal.last.status).to eq 'pending'
+      expect(mail).to have_received :deliver
     end
 
     context 'sem sucesso' do
@@ -40,6 +45,10 @@
           profile_id: contributor_portfoliorrr_profile_id,
           email: 'contributor@email.com'
         } }
+        mail = double 'mail', deliver: true
+        mailer = double 'ProposalMailer'
+        allow(ProposalMailer).to receive(:with).and_return mailer
+        allow(mailer).to receive(:notify_leader).and_return mail
 
         post(api_v1_proposals_path, params:)
 
@@ -47,6 +56,7 @@
         json_response = JSON.parse(response.body)
         expect(response).to have_http_status :conflict
         expect(json_response['errors']).to eq ['Usuário já faz parte deste projeto']
+        expect(mail).not_to have_received :deliver
       end
 
       it 'se já existe uma solicitação pendente' do