diff --git a/app/controllers/api/submissions_controller.rb b/app/controllers/api/submissions_controller.rb
index 8f61477f..0424e635 100644
--- a/app/controllers/api/submissions_controller.rb
+++ b/app/controllers/api/submissions_controller.rb
@@ -50,35 +50,14 @@ module Api
     end
 
     def create
-      is_send_email = !params[:send_email].in?(['false', false])
-
-      submissions =
-        if (emails = (params[:emails] || params[:email]).presence) && params[:submission].blank?
-          Submissions.create_from_emails(template: @template,
-                                         user: current_user,
-                                         source: :api,
-                                         mark_as_sent: is_send_email,
-                                         emails:)
-        else
-          submissions_attrs, attachments = normalize_submissions_params!(submissions_params[:submission], @template)
-
-          Submissions.create_from_submitters(
-            template: @template,
-            user: current_user,
-            source: :api,
-            mark_as_sent: is_send_email,
-            submitters_order: params[:submitters_order] || params[:order] || 'preserved',
-            submissions_attrs:
-          )
-        end
+      params[:send_email] = true unless params.key?(:send_email)
+      params[:send_sms] = false unless params.key?(:send_sms)
 
-      Submissions.send_signature_requests(submissions, send_email: is_send_email)
+      submissions = create_submissions(@template, params)
 
-      submitters = submissions.flat_map(&:submitters)
+      Submissions.send_signature_requests(submissions)
 
-      save_default_value_attachments!(attachments, submitters)
-
-      render json: submitters
+      render json: submissions.flat_map(&:submitters)
     rescue Submitters::NormalizeValues::UnknownFieldName, Submitters::NormalizeValues::UnknownSubmitterName => e
       render json: { error: e.message }, status: :unprocessable_entity
     end
@@ -91,6 +70,35 @@ module Api
 
     private
 
+    def create_submissions(template, params)
+      is_send_email = !params[:send_email].in?(['false', false])
+
+      if (emails = (params[:emails] || params[:email]).presence) && params[:submission].blank?
+        Submissions.create_from_emails(template:,
+                                       user: current_user,
+                                       source: :api,
+                                       mark_as_sent: is_send_email,
+                                       emails:,
+                                       params:)
+      else
+        submissions_attrs, attachments = normalize_submissions_params!(submissions_params, template)
+
+        submissions = Submissions.create_from_submitters(
+          template:,
+          user: current_user,
+          source: :api,
+          mark_as_sent: is_send_email,
+          submitters_order: params[:submitters_order] || params[:order] || 'preserved',
+          submissions_attrs:,
+          params:
+        )
+
+        save_default_value_attachments!(attachments, submissions.flat_map(&:submitters))
+
+        submissions
+      end
+    end
+
     def serialize_params
       {
         only: %i[id source submitters_order created_at updated_at],
@@ -107,11 +115,19 @@ module Api
     end
 
     def submissions_params
-      params.permit(submission: [{
-                      submitters: [[:uuid, :name, :email, :role, :completed, :phone, :application_key,
-                                    { values: {}, readonly_fields: [],
-                                      fields: [%i[name default_value readonly validation_pattern invalid_message]] }]]
-                    }])
+      key = params.key?(:submission) ? :submission : :submissions
+
+      params.permit(
+        key => [
+          [:send_email, :send_sms, {
+            message: %i[subject body],
+            submitters: [[:send_email, :send_sms, :uuid, :name, :email, :role,
+                          :completed, :phone, :application_key,
+                          { values: {}, readonly_fields: [], message: %i[subject body],
+                            fields: [%i[name default_value readonly validation_pattern invalid_message]] }]]
+          }]
+        ]
+      ).fetch(key, [])
     end
 
     def normalize_submissions_params!(submissions_params, template)
diff --git a/app/controllers/start_form_controller.rb b/app/controllers/start_form_controller.rb
index ca054121..e4e493bb 100644
--- a/app/controllers/start_form_controller.rb
+++ b/app/controllers/start_form_controller.rb
@@ -23,7 +23,8 @@ class StartFormController < ApplicationController
       @submitter.assign_attributes(
         uuid: @template.submitters.first['uuid'],
         ip: request.remote_ip,
-        ua: request.user_agent
+        ua: request.user_agent,
+        preferences: { 'send_email' => true }
       )
 
       @submitter.submission ||= Submission.new(template: @template,
diff --git a/app/controllers/submissions_controller.rb b/app/controllers/submissions_controller.rb
index a327d56e..64d8df23 100644
--- a/app/controllers/submissions_controller.rb
+++ b/app/controllers/submissions_controller.rb
@@ -34,23 +34,30 @@ class SubmissionsController < ApplicationController
   def create
     authorize!(:create, Submission)
 
+    if params[:is_custom_message] != '1'
+      params.delete(:subject)
+      params.delete(:body)
+    end
+
     submissions =
       if params[:emails].present?
         Submissions.create_from_emails(template: @template,
                                        user: current_user,
                                        source: :invite,
                                        mark_as_sent: params[:send_email] == '1',
-                                       emails: params[:emails])
+                                       emails: params[:emails],
+                                       params:)
       else
         Submissions.create_from_submitters(template: @template,
                                            user: current_user,
                                            source: :invite,
                                            submitters_order: params[:preserve_order] == '1' ? 'preserved' : 'random',
                                            mark_as_sent: params[:send_email] == '1',
-                                           submissions_attrs: submissions_params[:submission].to_h.values)
+                                           submissions_attrs: submissions_params[:submission].to_h.values,
+                                           params:)
       end
 
-    Submissions.send_signature_requests(submissions, params)
+    Submissions.send_signature_requests(submissions)
 
     redirect_to template_path(@template), notice: 'New recipients have been added'
   end
diff --git a/app/jobs/process_submitter_completion_job.rb b/app/jobs/process_submitter_completion_job.rb
index e481a74e..f8ebc058 100644
--- a/app/jobs/process_submitter_completion_job.rb
+++ b/app/jobs/process_submitter_completion_job.rb
@@ -31,7 +31,8 @@ class ProcessSubmitterCompletionJob < ApplicationJob
       SubmitterMailer.completed_email(submitter, user, bcc:).deliver_later!
     end
 
-    to = submitter.submission.submitters.sort_by(&:completed_at).select(&:email?).map(&:friendly_name).join(', ')
+    to = submitter.submission.submitters.reject { |e| e.preferences['send_email'] == false }
+                  .sort_by(&:completed_at).select(&:email?).map(&:friendly_name).join(', ')
 
     SubmitterMailer.documents_copy_email(submitter, to:).deliver_later! if to.present?
   end
@@ -48,6 +49,6 @@ class ProcessSubmitterCompletionJob < ApplicationJob
 
     next_submitter = submitter.submission.submitters.find { |s| s.uuid == next_submitter_item['uuid'] }
 
-    Submitters.send_signature_requests([next_submitter], send_email: true)
+    Submitters.send_signature_requests([next_submitter])
   end
 end
diff --git a/app/jobs/send_submitter_invitation_email_job.rb b/app/jobs/send_submitter_invitation_email_job.rb
index 4036df16..b57f54db 100644
--- a/app/jobs/send_submitter_invitation_email_job.rb
+++ b/app/jobs/send_submitter_invitation_email_job.rb
@@ -4,7 +4,7 @@ class SendSubmitterInvitationEmailJob < ApplicationJob
   def perform(params = {})
     submitter = Submitter.find(params['submitter_id'])
 
-    SubmitterMailer.invitation_email(submitter, subject: params['subject'], body: params['body']).deliver_now!
+    SubmitterMailer.invitation_email(submitter).deliver_now!
 
     SubmissionEvent.create!(submitter:, event_type: 'send_email')
 
diff --git a/app/mailers/submitter_mailer.rb b/app/mailers/submitter_mailer.rb
index 80e43313..68c9bcf5 100644
--- a/app/mailers/submitter_mailer.rb
+++ b/app/mailers/submitter_mailer.rb
@@ -3,18 +3,26 @@
 class SubmitterMailer < ApplicationMailer
   MAX_ATTACHMENTS_SIZE = 10.megabytes
 
-  def invitation_email(submitter, body: nil, subject: nil)
+  DEFAULT_INVITATION_SUBJECT = 'You are invited to submit a form'
+
+  def invitation_email(submitter)
     @current_account = submitter.submission.template.account
     @submitter = submitter
-    @body = body.presence
+
+    if submitter.preferences['email_message_uuid']
+      @email_message = submitter.account.email_messages.find_by(uuid: submitter.preferences['email_message_uuid'])
+    end
+
+    @body = @email_message&.body.presence
+    @subject = @email_message&.subject.presence
 
     @email_config = AccountConfigs.find_for_account(@current_account, AccountConfig::SUBMITTER_INVITATION_EMAIL_KEY)
 
     subject =
-      if @email_config || subject.present?
-        ReplaceEmailVariables.call(subject.presence || @email_config.value['subject'], submitter:)
+      if @email_config || @subject
+        ReplaceEmailVariables.call(@subject || @email_config.value['subject'], submitter:)
       else
-        'You are invited to submit a form'
+        DEFAULT_INVITATION_SUBJECT
       end
 
     mail(to: @submitter.friendly_name,
diff --git a/app/models/account.rb b/app/models/account.rb
index a9659b21..8c2792e9 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -15,6 +15,7 @@ class Account < ApplicationRecord
   has_many :users, dependent: :destroy
   has_many :encrypted_configs, dependent: :destroy
   has_many :account_configs, dependent: :destroy
+  has_many :email_messages, dependent: :destroy
   has_many :templates, dependent: :destroy
   has_many :template_folders, dependent: :destroy
   has_one :default_template_folder, -> { where(name: TemplateFolder::DEFAULT_NAME) },
diff --git a/app/models/email_message.rb b/app/models/email_message.rb
new file mode 100644
index 00000000..25156d6f
--- /dev/null
+++ b/app/models/email_message.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: email_messages
+#
+#  id         :bigint           not null, primary key
+#  body       :text             not null
+#  sha1       :string           not null
+#  subject    :text             not null
+#  uuid       :string           not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  account_id :bigint           not null
+#  author_id  :bigint           not null
+#
+# Indexes
+#
+#  index_email_messages_on_account_id  (account_id)
+#  index_email_messages_on_sha1        (sha1)
+#  index_email_messages_on_uuid        (uuid)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (account_id => accounts.id)
+#  fk_rails_...  (author_id => users.id)
+#
+class EmailMessage < ApplicationRecord
+  belongs_to :author, class_name: 'User'
+  belongs_to :account
+
+  attribute :uuid, :string, default: -> { SecureRandom.uuid }
+
+  before_validation :set_sha1, on: :create
+
+  def set_sha1
+    self.sha1 = Digest::SHA1.hexdigest({ subject:, body: }.to_json)
+  end
+end
diff --git a/app/models/submission.rb b/app/models/submission.rb
index e240c774..48ec202c 100644
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -6,6 +6,7 @@
 #
 #  id                  :bigint           not null, primary key
 #  deleted_at          :datetime
+#  preferences         :text             not null
 #  slug                :string           not null
 #  source              :text             not null
 #  submitters_order    :string           not null
@@ -36,9 +37,12 @@ class Submission < ApplicationRecord
   has_many :submitters, dependent: :destroy
   has_many :submission_events, dependent: :destroy
 
+  attribute :preferences, :string, default: -> { {} }
+
   serialize :template_fields, JSON
   serialize :template_schema, JSON
   serialize :template_submitters, JSON
+  serialize :preferences, JSON
 
   attribute :source, :string, default: 'link'
   attribute :submitters_order, :string, default: 'random'
diff --git a/app/models/submitter.rb b/app/models/submitter.rb
index 36c21508..f5065d7e 100644
--- a/app/models/submitter.rb
+++ b/app/models/submitter.rb
@@ -12,6 +12,7 @@
 #  name            :string
 #  opened_at       :datetime
 #  phone           :string
+#  preferences     :text             not null
 #  sent_at         :datetime
 #  slug            :string           not null
 #  ua              :string
@@ -37,9 +38,11 @@ class Submitter < ApplicationRecord
   has_one :account, through: :template
 
   attribute :values, :string, default: -> { {} }
+  attribute :preferences, :string, default: -> { {} }
   attribute :slug, :string, default: -> { SecureRandom.base58(14) }
 
   serialize :values, JSON
+  serialize :preferences, JSON
 
   has_many_attached :documents
   has_many_attached :attachments
diff --git a/app/models/user.rb b/app/models/user.rb
index d8f23419..92129293 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -55,6 +55,7 @@ class User < ApplicationRecord
   has_many :template_folders, dependent: :destroy, foreign_key: :author_id, inverse_of: :author
   has_many :user_configs, dependent: :destroy
   has_many :encrypted_configs, dependent: :destroy, class_name: 'EncryptedUserConfig'
+  has_many :email_messages, dependent: :destroy
 
   devise :two_factor_authenticatable, :recoverable, :rememberable, :validatable, :trackable
   devise :registerable, :omniauthable, omniauth_providers: [:google_oauth2] if Docuseal.multitenant?
diff --git a/db/migrate/20231122203341_add_preferences_to_submitters.rb b/db/migrate/20231122203341_add_preferences_to_submitters.rb
new file mode 100644
index 00000000..45b9bc87
--- /dev/null
+++ b/db/migrate/20231122203341_add_preferences_to_submitters.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class AddPreferencesToSubmitters < ActiveRecord::Migration[7.0]
+  class MigrationSubmitter < ApplicationRecord
+    self.table_name = 'submitters'
+  end
+
+  def change
+    add_column :submitters, :preferences, :text
+
+    MigrationSubmitter.where(preferences: nil).update_all(preferences: '{}')
+
+    change_column_null :submitters, :preferences, false
+  end
+end
diff --git a/db/migrate/20231122203347_add_preferences_to_submissions.rb b/db/migrate/20231122203347_add_preferences_to_submissions.rb
new file mode 100644
index 00000000..5621845b
--- /dev/null
+++ b/db/migrate/20231122203347_add_preferences_to_submissions.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class AddPreferencesToSubmissions < ActiveRecord::Migration[7.0]
+  class MigrationSubmission < ApplicationRecord
+    self.table_name = 'submissions'
+  end
+
+  def change
+    add_column :submissions, :preferences, :text
+
+    MigrationSubmission.where(preferences: nil).update_all(preferences: '{}')
+
+    change_column_null :submissions, :preferences, false
+  end
+end
diff --git a/db/migrate/20231122212612_create_email_messages.rb b/db/migrate/20231122212612_create_email_messages.rb
new file mode 100644
index 00000000..e3efb23f
--- /dev/null
+++ b/db/migrate/20231122212612_create_email_messages.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class CreateEmailMessages < ActiveRecord::Migration[7.0]
+  def change
+    create_table :email_messages do |t|
+      t.string :uuid, null: false, index: true
+      t.references :author, null: false, foreign_key: { to_table: :users }, index: false
+      t.references :account, null: false, foreign_key: true, index: true
+      t.text :subject, null: false
+      t.text :body, null: false
+      t.string :sha1, null: false, index: true
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index b01abe1f..c518087d 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_11_19_222105) do
+ActiveRecord::Schema[7.0].define(version: 2023_11_22_212612) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -81,6 +81,20 @@ ActiveRecord::Schema[7.0].define(version: 2023_11_19_222105) do
     t.index ["submitter_id"], name: "index_document_generation_events_on_submitter_id"
   end
 
+  create_table "email_messages", force: :cascade do |t|
+    t.string "uuid", null: false
+    t.bigint "author_id", null: false
+    t.bigint "account_id", null: false
+    t.text "subject", null: false
+    t.text "body", null: false
+    t.string "sha1", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["account_id"], name: "index_email_messages_on_account_id"
+    t.index ["sha1"], name: "index_email_messages_on_sha1"
+    t.index ["uuid"], name: "index_email_messages_on_uuid"
+  end
+
   create_table "encrypted_configs", force: :cascade do |t|
     t.bigint "account_id", null: false
     t.string "key", null: false
@@ -125,6 +139,7 @@ ActiveRecord::Schema[7.0].define(version: 2023_11_19_222105) do
     t.text "source", null: false
     t.string "submitters_order", null: false
     t.string "slug", null: false
+    t.text "preferences", null: false
     t.index ["created_by_user_id"], name: "index_submissions_on_created_by_user_id"
     t.index ["slug"], name: "index_submissions_on_slug", unique: true
     t.index ["template_id"], name: "index_submissions_on_template_id"
@@ -146,6 +161,7 @@ ActiveRecord::Schema[7.0].define(version: 2023_11_19_222105) do
     t.string "name"
     t.string "phone"
     t.string "application_key"
+    t.text "preferences", null: false
     t.index ["email"], name: "index_submitters_on_email"
     t.index ["slug"], name: "index_submitters_on_slug", unique: true
     t.index ["submission_id"], name: "index_submitters_on_submission_id"
@@ -229,6 +245,8 @@ ActiveRecord::Schema[7.0].define(version: 2023_11_19_222105) do
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "document_generation_events", "submitters"
+  add_foreign_key "email_messages", "accounts"
+  add_foreign_key "email_messages", "users", column: "author_id"
   add_foreign_key "encrypted_configs", "accounts"
   add_foreign_key "encrypted_user_configs", "users"
   add_foreign_key "submission_events", "submissions"
diff --git a/lib/email_messages.rb b/lib/email_messages.rb
new file mode 100644
index 00000000..49e9de12
--- /dev/null
+++ b/lib/email_messages.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module EmailMessages
+  module_function
+
+  def find_or_create_for_account_user(account, user, subject, body)
+    subject = SubmitterMailer::DEFAULT_INVITATION_SUBJECT if subject.blank?
+
+    sha1 = Digest::SHA1.hexdigest({ subject:, body: }.to_json)
+
+    message = account.email_messages.find_by(sha1:)
+
+    message ||= account.email_messages.create!(author: user, subject:, body:)
+
+    message
+  end
+end
diff --git a/lib/submissions.rb b/lib/submissions.rb
index 70aa41d1..e4630fa7 100644
--- a/lib/submissions.rb
+++ b/lib/submissions.rb
@@ -27,11 +27,17 @@ module Submissions
     submission.save!
   end
 
-  def create_from_emails(template:, user:, emails:, source:, mark_as_sent: false)
+  def create_from_emails(template:, user:, emails:, source:, mark_as_sent: false, params: {})
+    preferences = Submitters.normalize_preferences(template.account, user, params)
+
     parse_emails(emails).uniq.map do |email|
-      submission = template.submissions.new(created_by_user: user, source:, template_submitters: template.submitters)
+      submission = template.submissions.new(created_by_user: user,
+                                            source:,
+                                            template_submitters: template.submitters)
+
       submission.submitters.new(email: normalize_email(email),
                                 uuid: template.submitters.first['uuid'],
+                                preferences:,
                                 sent_at: mark_as_sent ? Time.current : nil)
 
       submission.tap(&:save!)
@@ -45,13 +51,13 @@ module Submissions
   end
 
   def create_from_submitters(template:, user:, submissions_attrs:, source:, mark_as_sent: false,
-                             submitters_order: DEFAULT_SUBMITTERS_ORDER)
+                             submitters_order: DEFAULT_SUBMITTERS_ORDER, params: {})
     Submissions::CreateFromSubmitters.call(
-      template:, user:, submissions_attrs:, source:, mark_as_sent:, submitters_order:
+      template:, user:, submissions_attrs:, source:, mark_as_sent:, submitters_order:, params:
     )
   end
 
-  def send_signature_requests(submissions, params)
+  def send_signature_requests(submissions)
     submissions.each do |submission|
       submitters = submission.submitters.reject(&:completed_at?)
 
@@ -59,9 +65,9 @@ module Submissions
         first_submitter =
           submission.template_submitters.filter_map { |s| submitters.find { |e| e.uuid == s['uuid'] } }.first
 
-        Submitters.send_signature_requests([first_submitter], params)
+        Submitters.send_signature_requests([first_submitter])
       else
-        Submitters.send_signature_requests(submitters, params)
+        Submitters.send_signature_requests(submitters)
       end
     end
   end
diff --git a/lib/submissions/create_from_submitters.rb b/lib/submissions/create_from_submitters.rb
index 1edbd631..0d094b2b 100644
--- a/lib/submissions/create_from_submitters.rb
+++ b/lib/submissions/create_from_submitters.rb
@@ -4,7 +4,9 @@ module Submissions
   module CreateFromSubmitters
     module_function
 
-    def call(template:, user:, submissions_attrs:, source:, submitters_order:, mark_as_sent: false)
+    def call(template:, user:, submissions_attrs:, source:, submitters_order:, mark_as_sent: false, params: {})
+      preferences = Submitters.normalize_preferences(template.account, user, params)
+
       Array.wrap(submissions_attrs).map do |attrs|
         submission = template.submissions.new(created_by_user: user, source:,
                                               template_submitters: template.submitters, submitters_order:)
@@ -18,7 +20,11 @@ module Submissions
 
           is_order_sent = submitters_order == 'random' || index.zero?
 
-          build_submitter(submission:, attrs: submitter_attrs, uuid:, is_order_sent:, mark_as_sent:)
+          submission_preferences = Submitters.normalize_preferences(template.account, user, attrs)
+
+          build_submitter(submission:, attrs: submitter_attrs, uuid:,
+                          is_order_sent:, mark_as_sent:, user:,
+                          preferences: preferences.merge(submission_preferences))
         end
 
         submission.tap(&:save!)
@@ -85,8 +91,9 @@ module Submissions
         template.submitters[index]&.dig('uuid')
     end
 
-    def build_submitter(submission:, attrs:, uuid:, is_order_sent:, mark_as_sent:)
+    def build_submitter(submission:, attrs:, uuid:, is_order_sent:, mark_as_sent:, user:, preferences:)
       email = Submissions.normalize_email(attrs[:email])
+      submitter_preferences = Submitters.normalize_preferences(submission.account, user, attrs)
 
       submission.submitters.new(
         email:,
@@ -96,6 +103,7 @@ module Submissions
         completed_at: attrs[:completed] ? Time.current : nil,
         sent_at: mark_as_sent && email.present? && is_order_sent ? Time.current : nil,
         values: attrs[:values] || {},
+        preferences: preferences.merge(submitter_preferences),
         uuid:
       )
     end
diff --git a/lib/submitters.rb b/lib/submitters.rb
index 6a92df59..789b43de 100644
--- a/lib/submitters.rb
+++ b/lib/submitters.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module Submitters
+  TRUE_VALUES = ['1', 'true', true].freeze
+
   module_function
 
   def search(submitters, keyword)
@@ -43,21 +45,30 @@ module Submitters
     )
   end
 
-  def send_signature_requests(submitters, params)
-    return if params[:send_email] != true && params[:send_email] != '1'
+  def normalize_preferences(account, user, params)
+    preferences = {}
 
-    submitters.each do |submitter|
-      next if submitter.email.blank?
+    message_params = params['message'].presence || params.slice('subject', 'body').presence
 
-      enqueue_invitation_email(submitter, params)
+    if message_params.present?
+      email_message = EmailMessages.find_or_create_for_account_user(account, user,
+                                                                    message_params['subject'],
+                                                                    message_params['body'])
     end
+
+    preferences['email_message_uuid'] = email_message.uuid if email_message
+    preferences['send_email'] = params['send_email'].in?(TRUE_VALUES) if params.key?('send_email')
+    preferences['send_sms'] = params['send_sms'].in?(TRUE_VALUES) if params.key?('send_sms')
+
+    preferences
   end
 
-  def enqueue_invitation_email(submitter, params)
-    subject, body = params.values_at(:subject, :body) if params[:is_custom_message] == '1'
+  def send_signature_requests(submitters)
+    submitters.each do |submitter|
+      next if submitter.email.blank?
+      next if submitter.preferences['send_email'] == false
 
-    SendSubmitterInvitationEmailJob.perform_later('submitter_id' => submitter.id,
-                                                  'body' => body,
-                                                  'subject' => subject)
+      SendSubmitterInvitationEmailJob.perform_later('submitter_id' => submitter.id)
+    end
   end
 end