Corrected email username variable

netbox/netbox/settings.py

@@ -43,7 +43,7 @@ DATABASES = {
 # Email
 EMAIL_HOST = EMAIL.get('SERVER')
 EMAIL_PORT = EMAIL.get('PORT', 25)
-EMAIL_HOST_USER = EMAIL.get('USER')
+EMAIL_HOST_USER = EMAIL.get('USERNAME')
 EMAIL_HOST_PASSWORD = EMAIL.get('PASSWORD')
 EMAIL_TIMEOUT = EMAIL.get('TIMEOUT', 10)
 SERVER_EMAIL = EMAIL.get('FROM_EMAIL')