preserve submitter preferences

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