diff --git a/atst/app.py b/atst/app.py
index 9e772e56..715e93ba 100644
--- a/atst/app.py
+++ b/atst/app.py
@@ -182,7 +182,7 @@ def make_mailer(app):
             port=app.config.get("MAIL_PORT"),
             username=app.config.get("MAIL_SENDER"),
             password=app.config.get("MAIL_PASSWORD"),
-            use_tls=app.config.get("MAIL_TLS")
+            use_tls=app.config.get("MAIL_TLS"),
         )
     sender = app.config.get("MAIL_SENDER")
     app.mailer = mailer.Mailer(mailer_connection, sender)
diff --git a/atst/utils/mailer.py b/atst/utils/mailer.py
index 0e3995a1..52cd209c 100644
--- a/atst/utils/mailer.py
+++ b/atst/utils/mailer.py
@@ -4,7 +4,6 @@ from email.message import EmailMessage
 
 
 class MailConnection(object):
-
     def send(self, message):
         raise NotImplementedError()
 
@@ -63,7 +62,6 @@ class RedisConnection(MailConnection):
 
 
 class Mailer(object):
-
     def __init__(self, connection, sender):
         self.connection = connection
         self.sender = sender