handle 2fa email bounce

app/controllers/start_form_controller.rb

@@ -162,6 +162,10 @@ class StartFormController < ApplicationController
     end
   rescue Submitters::StartForm::NotSaved
     render :show, status: :unprocessable_content
+  rescue Submitters::BouncedEmail => e
+    @error_message = e.message
+
+    render :error, status: :unprocessable_content
   rescue Submitters::UnableToSendCode, Submitters::InvalidOtp => e
     redirect_to start_form_path(template.slug, params: submitter_params.merge(email_verification: true)),
                 alert: e.message

app/controllers/start_form_email_2fa_send_controller.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class StartFormEmail2faSendController < ApplicationController
+  layout 'form'
+
   around_action :with_browser_locale
 
   skip_before_action :authenticate_user!
@@ -23,6 +25,10 @@ class StartFormEmail2faSendController < ApplicationController
 
     redirect_to start_form_path(@template.slug, params: submitter_params.merge(email_verification: true)),
                 **redir_params
+  rescue Submitters::BouncedEmail => e
+    @error_message = e.message
+
+    render 'start_form/error', status: :unprocessable_content
   rescue Submitters::UnableToSendCode => e
     redirect_to start_form_path(@template.slug, params: submitter_params.merge(email_verification: true)),
                 alert: e.message

app/controllers/start_form_resubmit_controller.rb

@@ -87,6 +87,10 @@ class StartFormResubmitController < ApplicationController
     end
   rescue Submitters::StartForm::NotSaved
     render 'start_form/show', status: :unprocessable_content
+  rescue Submitters::BouncedEmail => e
+    @error_message = e.message
+
+    render 'start_form/error', status: :unprocessable_content
   rescue Submitters::UnableToSendCode, Submitters::InvalidOtp => e
     flash.now[:alert] = e.message
 

app/controllers/submit_form_email_2fas_controller.rb

@@ -35,6 +35,12 @@ class SubmitFormEmail2fasController < ApplicationController
 
     RateLimit.call("send-email-code-#{@submitter.id}", limit: 2, ttl: 45.seconds, enabled: true)
 
+    if Docuseal.multitenant? && Submitters.email_bounced_recently?(@submitter.email)
+      Rollbar.warning("Bounced OTP email for submitter: #{@submitter.id}") if defined?(Rollbar)
+
+      return redirect_to submit_form_path(@submitter.slug, status: :error), alert: I18n.t(:verification_email_bounced)
+    end
+
     SendSubmitterVerificationEmailJob.perform_async('submitter_id' => @submitter.id, 'locale' => I18n.locale.to_s)
 
     redir_params = params[:resend] ? { alert: I18n.t(:code_has_been_resent) } : {}