diff --git a/tests/test_cookiecutter_generation.py b/tests/test_cookiecutter_generation.py
index d4db10856..91f44ae5a 100755
--- a/tests/test_cookiecutter_generation.py
+++ b/tests/test_cookiecutter_generation.py
@@ -48,6 +48,15 @@ SUPPORTED_COMBINATIONS = [
     {"cloud_provider": "GCP", "use_whitenoise": "n"},
     {"cloud_provider": "None", "use_whitenoise": "y"},
     # Note: cloud_provider=None AND use_whitenoise=n is not supported
+    {"mail_service": "Mailgun"},
+    {"mail_service": "Amazon SES"},
+    {"mail_service": "Mailjet"},
+    {"mail_service": "Mandrill"},
+    {"mail_service": "Postmark"},
+    {"mail_service": "Sendgrid"},
+    {"mail_service": "SendinBlue"},
+    {"mail_service": "SparkPost"},
+    {"mail_service": "Other SMTP"},
     {"use_drf": "y"},
     {"use_drf": "n"},
     {"js_task_runner": "None"},
@@ -73,21 +82,10 @@ SUPPORTED_COMBINATIONS = [
     {"keep_local_envs_in_vcs": "n"},
     {"debug": "y"},
     {"debug": "n"},
-    {"mail_service", "AWS SES"},
-    {"mail_service", "Mailgun"},
-    {"mail_service", "Mailjet"},
-    {"mail_service", "Mandrill"},
-    {"mail_service", "Postmark"},
-    {"mail_service", "Sendgrid"},
-    {"mail_service", "SendinBlue"},
-    {"mail_service", "SparkPost"},
-    {"mail_service", "Other SMTP"},
 ]
 
 UNSUPPORTED_COMBINATIONS = [
     {"cloud_provider": "None", "use_whitenoise": "n"},
-    {"cloud_provider": "GCP", "mail_service": "Amazon SES"},
-    {"cloud_provider": "None", "mail_service": "Amazon SES"}
 ]
 
 
diff --git a/{{cookiecutter.project_slug}}/config/settings/production.py b/{{cookiecutter.project_slug}}/config/settings/production.py
index 6b07141dc..13e8c6971 100644
--- a/{{cookiecutter.project_slug}}/config/settings/production.py
+++ b/{{cookiecutter.project_slug}}/config/settings/production.py
@@ -195,10 +195,7 @@ EMAIL_BACKEND = "anymail.backends.mailgun.EmailBackend"
 ANYMAIL = {
     "MAILGUN_API_KEY": env("MAILGUN_API_KEY"),
     "MAILGUN_SENDER_DOMAIN": env("MAILGUN_DOMAIN"),
-    "MAILGUN_API_URL": env(
-        "MAILGUN_API_URL",
-        default="https://api.mailgun.net/v3"
-    ),
+    "MAILGUN_API_URL": env("MAILGUN_API_URL", default="https://api.mailgun.net/v3"),
 }
 {%- elif cookiecutter.mail_service == 'Amazon SES' %}
 # https://anymail.readthedocs.io/en/stable/esps/amazon_ses/
@@ -210,10 +207,7 @@ EMAIL_BACKEND = "anymail.backends.mailjet.EmailBackend"
 ANYMAIL = {
     "MAILJET_API_KEY": env("MAILJET_API_KEY"),
     "MAILJET_SECRET_KEY": env("MAILJET_SECRET_KEY"),
-    "MAILJET_API_URL": env(
-        "MAILJET_API_URL",
-        default="https://api.mailjet.com/v3"
-    ),
+    "MAILJET_API_URL": env("MAILJET_API_URL", default="https://api.mailjet.com/v3"),
 }
 {%- elif cookiecutter.mail_service == 'Mandrill' %}
 # https://anymail.readthedocs.io/en/stable/esps/mandrill/
@@ -221,8 +215,7 @@ EMAIL_BACKEND = "anymail.backends.mandrill.EmailBackend"
 ANYMAIL = {
     "MANDRILL_API_KEY": env("MANDRILL_API_KEY"),
     "MANDRILL_API_URL": env(
-        "MANDRILL_API_URL",
-        default="https://mandrillapp.com/api/1.0"
+        "MANDRILL_API_URL", default="https://mandrillapp.com/api/1.0"
     ),
 }
 {%- elif cookiecutter.mail_service == 'Postmark' %}
@@ -230,10 +223,7 @@ ANYMAIL = {
 EMAIL_BACKEND = "anymail.backends.postmark.EmailBackend"
 ANYMAIL = {
     "POSTMARK_SERVER_TOKEN": env("POSTMARK_SERVER_TOKEN"),
-    "POSTMARK_API_URL": env(
-        "POSTMARK_API_URL",
-        default="https://api.postmarkapp.com/"
-    ),
+    "POSTMARK_API_URL": env("POSTMARK_API_URL", default="https://api.postmarkapp.com/"),
 }
 {%- elif cookiecutter.mail_service == 'Sendgrid' %}
 # https://anymail.readthedocs.io/en/stable/esps/sendgrid/
@@ -242,10 +232,7 @@ ANYMAIL = {
     "SENDGRID_API_KEY": env("SENDGRID_API_KEY"),
     "SENDGRID_GENERATE_MESSAGE_ID": env("SENDGRID_GENERATE_MESSAGE_ID"),
     "SENDGRID_MERGE_FIELD_FORMAT": env("SENDGRID_MERGE_FIELD_FORMAT"),
-    "SENDGRID_API_URL": env(
-        "SENDGRID_API_URL",
-        default="https://api.sendgrid.com/v3/"
-    ),
+    "SENDGRID_API_URL": env("SENDGRID_API_URL", default="https://api.sendgrid.com/v3/"),
 }
 {%- elif cookiecutter.mail_service == 'SendinBlue' %}
 # https://anymail.readthedocs.io/en/stable/esps/sendinblue/
@@ -253,8 +240,7 @@ EMAIL_BACKEND = "anymail.backends.sendinblue.EmailBackend"
 ANYMAIL = {
     "SENDINBLUE_API_KEY": env("SENDINBLUE_API_KEY"),
     "SENDINBLUE_API_URL": env(
-        "SENDINBLUE_API_URL",
-        default="https://api.sendinblue.com/v3/"
+        "SENDINBLUE_API_URL", default="https://api.sendinblue.com/v3/"
     ),
 }
 {%- elif cookiecutter.mail_service == 'SparkPost' %}
@@ -263,8 +249,7 @@ EMAIL_BACKEND = "anymail.backends.sparkpost.EmailBackend"
 ANYMAIL = {
     "SPARKPOST_API_KEY": env("SPARKPOST_API_KEY"),
     "SPARKPOST_API_URL": env(
-        "SPARKPOST_API_URL",
-        default="https://api.sparkpost.com/api/v1"
+        "SPARKPOST_API_URL", default="https://api.sparkpost.com/api/v1"
     ),
 }
 {%- elif cookiecutter.mail_service == 'Other SMTP' %}