users: fix exception in can_receive_email?.

app/models/user.rb

@@ -362,7 +362,7 @@ class User < ApplicationRecord
 
   module EmailMethods
     def can_receive_email?(require_verified_email: true)
-      email_address.present? && email_address.is_deliverable? && (email_address.is_verified? || !require_verification)
+      email_address.present? && email_address.is_deliverable? && (email_address.is_verified? || !require_verified_email)
     end
 
     def change_email(new_email, request)

test/unit/user_mailer_test.rb

@@ -27,6 +27,13 @@ class UserMailerTest < ActionMailer::TestCase
         mail = UserMailer.dmail_notice(@dmail)
         assert_emails(0) { mail.deliver_now }
       end
+
+      should "not send an email for a user with an unverified address" do
+        @user = create(:user, email_address: build(:email_address, is_verified: false))
+        @dmail = create(:dmail, owner: @user, to: @user)
+        mail = UserMailer.dmail_notice(@dmail)
+        assert_emails(0) { mail.deliver_now }
+      end
     end
 
     context "password_reset method" do