Fix flake8 errors on emails

emails/context_processors.py

@@ -1,7 +1,5 @@
 from emails.utils import get_email_domain_from_settings
 
-from django.conf import settings
-
 
 def relay_from_domain(request):
     return {'RELAY_DOMAIN': get_email_domain_from_settings()}

emails/tests/models_tests.py

@@ -108,7 +108,7 @@ def test_make_relay_address_non_premium_user_cannot_pass_limit(self):
     def test_make_relay_address_with_specified_domain(self):
         relay_address = RelayAddress.make_relay_address(self.user_profile, domain='domain.com')
         assert relay_address.domain == 'domain.com'
-        
+
     def test_delete_adds_deleted_address_object(self):
         relay_address = baker.make(RelayAddress)
         address_hash = sha256(
@@ -409,7 +409,6 @@ def test_display_name_does_not_exist(self):
         )
         profile = Profile.objects.get(user=social_account.user)
         assert profile.display_name == None
-
 
 
 class DomainAddressTest(TestCase):

emails/tests/utils_tests.py

@@ -75,7 +75,7 @@ def test_get_email_domain_from_settings_on_heroku_test_mozmail_false(self):
     def test_get_email_domain_from_settings_not_on_heroku_test_mozmail_false(self):
         email_domain = get_email_domain_from_settings()
         assert 'test.com' == email_domain
-    
+
     @override_settings(ON_HEROKU=True, ADDITIONAL_DOMAINS=['mozmail-test.com'], TEST_MOZMAIL=True)
     def test_get_email_domain_from_settings_test_mozmail_true(self):
         email_domain = get_email_domain_from_settings()

emails/views.py

@@ -400,7 +400,7 @@ def _get_address(to_address, local_portion, domain_portion):
     # if the domain is not the site's 'top' relay domain,
     # it may be for a user's subdomain
     email_domains = settings.ADDITIONAL_DOMAINS + [get_email_domain_from_settings()]
-    if not domain_portion in email_domains:
+    if domain_portion not in email_domains:
         return _get_domain_address(to_address, local_portion, domain_portion)
 
     # the domain is the site's 'top' relay domain, so look up the RelayAddress