diff --git a/homeassistant/components/mailgun/__init__.py b/homeassistant/components/mailgun/__init__.py
index 4bcca0848f4..57c83d8c20c 100644
--- a/homeassistant/components/mailgun/__init__.py
+++ b/homeassistant/components/mailgun/__init__.py
@@ -6,13 +6,12 @@ import logging
 
 import voluptuous as vol
 
-import homeassistant.helpers.config_validation as cv
 from homeassistant.const import CONF_API_KEY, CONF_DOMAIN, CONF_WEBHOOK_ID
 from homeassistant.helpers import config_entry_flow
+import homeassistant.helpers.config_validation as cv
 
 from .const import DOMAIN
 
-
 _LOGGER = logging.getLogger(__name__)
 
 CONF_SANDBOX = "sandbox"
diff --git a/homeassistant/components/mailgun/config_flow.py b/homeassistant/components/mailgun/config_flow.py
index c575b4c0354..6fe87e7cbf4 100644
--- a/homeassistant/components/mailgun/config_flow.py
+++ b/homeassistant/components/mailgun/config_flow.py
@@ -1,7 +1,7 @@
 """Config flow for Mailgun."""
 from homeassistant.helpers import config_entry_flow
-from .const import DOMAIN
 
+from .const import DOMAIN
 
 config_entry_flow.register_webhook_flow(
     DOMAIN,
diff --git a/homeassistant/components/mailgun/notify.py b/homeassistant/components/mailgun/notify.py
index efa5a17430c..c2222cfd742 100644
--- a/homeassistant/components/mailgun/notify.py
+++ b/homeassistant/components/mailgun/notify.py
@@ -1,6 +1,12 @@
 """Support for the Mailgun mail notifications."""
 import logging
 
+from pymailgunner import (
+    Client,
+    MailgunCredentialsError,
+    MailgunDomainError,
+    MailgunError,
+)
 import voluptuous as vol
 
 from homeassistant.components.notify import (
@@ -58,7 +64,6 @@ class MailgunNotificationService(BaseNotificationService):
 
     def initialize_client(self):
         """Initialize the connection to Mailgun."""
-        from pymailgunner import Client
 
         self._client = Client(self._api_key, self._domain, self._sandbox)
         _LOGGER.debug("Mailgun domain: %s", self._client.domain)
@@ -68,7 +73,6 @@ class MailgunNotificationService(BaseNotificationService):
 
     def connection_is_valid(self):
         """Check whether the provided credentials are valid."""
-        from pymailgunner import MailgunCredentialsError, MailgunDomainError
 
         try:
             self.initialize_client()
@@ -82,7 +86,6 @@ class MailgunNotificationService(BaseNotificationService):
 
     def send_message(self, message="", **kwargs):
         """Send a mail to the recipient."""
-        from pymailgunner import MailgunError
 
         subject = kwargs.get(ATTR_TITLE, ATTR_TITLE_DEFAULT)
         data = kwargs.get(ATTR_DATA)