validate sender email

app/controllers/submitters_send_email_controller.rb

@@ -11,7 +11,11 @@ class SubmittersSendEmailController < ApplicationController
                            alert: 'Email has been sent already.')
     end
 
-    SubmitterMailer.invitation_email(@submitter).deliver_later!
+    mail = SubmitterMailer.invitation_email(@submitter)
+
+    Submitters::ValidateSending.call(@submitter, mail)
+
+    mail.deliver_later!
 
     SubmissionEvent.create!(submitter: @submitter, event_type: 'send_email')
 

app/jobs/send_submitter_invitation_email_job.rb

@@ -4,7 +4,11 @@ class SendSubmitterInvitationEmailJob < ApplicationJob
   def perform(params = {})
     submitter = Submitter.find(params['submitter_id'])
 
-    SubmitterMailer.invitation_email(submitter).deliver_now!
+    mail = SubmitterMailer.invitation_email(submitter)
+
+    Submitters::ValidateSending.call(submitter, mail)
+
+    mail.deliver_now!
 
     SubmissionEvent.create!(submitter:, event_type: 'send_email')
 

lib/submitters/validate_sending.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Submitters
+  module ValidateSending
+    InvalidEmail = Class.new(StandardError)
+
+    module_function
+
+    def call(submitter, _mail)
+      raise InvalidEmail unless submitter.email.to_s.include?('@')
+
+      true
+    end
+  end
+end