diff --git a/Gemfile b/Gemfile
index 8b10c0e7..2a67142e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -19,6 +19,7 @@ gem 'honeybadger'
 gem 'jbuilder', '~> 2.5'
 gem 'jquery-rails'
 gem 'pg', '~> 1.1'
+gem 'postmark-rails'
 gem 'puma', '~> 3.12'
 gem 'rack-cors', require: 'rack/cors'
 gem 'rails', '~> 5.2.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index b45ebe43..d016e45e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -190,6 +190,11 @@ GEM
       capybara (~> 2.1)
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
+    postmark (1.21.1)
+      json
+    postmark-rails (0.20.0)
+      actionmailer (>= 3.0.0)
+      postmark (~> 1.15)
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
@@ -340,6 +345,7 @@ DEPENDENCIES
   pg (~> 1.1)
   phantomjs
   poltergeist
+  postmark-rails
   pry-rails
   puma (~> 3.12)
   rack-cors
@@ -359,4 +365,4 @@ RUBY VERSION
    ruby 2.5.1p57
 
 BUNDLED WITH
-   1.16.1
+   1.17.3
diff --git a/app/controllers/api/v1/send_grid/events_controller.rb b/app/controllers/api/v1/send_grid/events_controller.rb
deleted file mode 100644
index 69a8e6b7..00000000
--- a/app/controllers/api/v1/send_grid/events_controller.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-class Api::V1::SendGrid::EventsController < Api::V1::ApiController
-  skip_before_action :doorkeeper_authorize!, only: [:update]
-
-  def update
-    webhook_data = JSON.parse(request.body.read)
-    webhook_data.each do |data|
-      invitation = Invitation.find_by(email: data["email"])
-      invitation.status = data["event"] if invitation
-      invitation.save
-    end
-  end
-end
diff --git a/config/application.rb b/config/application.rb
index 69186c23..571eb69e 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -18,17 +18,9 @@
 
 module Census
   class Application < Rails::Application
-    config.action_mailer.delivery_method = :smtp
-
-    config.action_mailer.smtp_settings = {
-      address:              'smtp.sendgrid.net',
-      port:                 '587',
-      domain:               'heroku.com',
-      user_name:            ENV["SENDGRID_USERNAME"],
-      password:             ENV["SENDGRID_PASSWORD"],
-      authentication:       'plain',
-      enable_starttls_auto: true
-    }
+    # Set up transactional emails through Postmark
+    config.action_mailer.delivery_method = :postmark
+    config.action_mailer.postmark_settings = { api_token: Rails.application.secrets.postmark_api_token }
 
     config.log_tags = [
       :request_id,
diff --git a/config/routes.rb b/config/routes.rb
index 0e8fcde1..c67e01f9 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -49,7 +49,6 @@
       resources :groups, only: [:update, :destroy]
       get '/cohorts', to: 'cohorts#index'
       get '/user_credentials', to: 'credentials#show'
-      post '/sendgrid/events', to: 'send_grid/events#update'
     end
   end
 end
diff --git a/config/secrets.yml b/config/secrets.yml
index 0eafe40d..ab7701cc 100644
--- a/config/secrets.yml
+++ b/config/secrets.yml
@@ -15,3 +15,4 @@ production:
   api_auth_secret: <%= ENV.fetch("API_AUTH_SECRET", "no-api-secret-set") %>
   enroll_graphql_endpoint: <%= ENV.fetch("ENROLL_GRAPHQL_ENDPOINT", "http://localhost:3001/graphql") %>
   require_ssl_redirect_uri: <%= ENV.fetch('REQUIRE_SSL_REDIRECT_URI', 'true') == 'true' %>
+  postmark_api_token: <%= ENV['POSTMARK_API_TOKEN'] %>
diff --git a/spec/requests/api/v1/send_grid/events_spec.rb b/spec/requests/api/v1/send_grid/events_spec.rb
deleted file mode 100644
index 24707262..00000000
--- a/spec/requests/api/v1/send_grid/events_spec.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Api::V1::SendGrid::EventsController do
-  context "Post request is sent to SendGrid" do
-    it "updates status of bounced email" do
-      create :invitation, email: "email@example.com", status: "mailed"
-      post_body = [{event: "bounce", email: "email@example.com"}].to_json
-      post '/api/v1/sendgrid/events', params: post_body
-
-      expect(Invitation.first.bounce?).to eq(true)
-      expect(response.status).to eq(204)
-    end
-  end
-end