Revert "Prepare config for mailgun"

This reverts commit eb6b3ec34e.

.env

@@ -6,7 +6,3 @@ MQTT_CLIENT=local
 APP_MAIL_USERNAME=final.iot.backend.mailer@gmail.com
 APP_MAIL_PASSWORD=FinalIoT1234
 FLASK_ENV=development
-MAILGUN_SMTP_SERVER=smtp.googlemail.com
-MAILGUN_SMPT_PORT=465
-MAILGUN_SMPT_LOGIN=final.iot.backend.mailer@gmail.com
-MAILGUN_SMPT_PASSWORD=FinalIoT1234

config.py

@@ -42,15 +42,15 @@ CELERY_BROKER_URL = os.environ['REDIS_URL']
 CELERY_RESULT_BACKEND = os.environ['REDIS_URL']
 
 # Mailer config
-MAIL_SERVER = os.environ['MAILGUN_SMTP_SERVER']
-MAIL_PORT = os.environ['MAILGUN_SMTP_PORT']
+MAIL_SERVER = 'smtp.googlemail.com'
+MAIL_PORT = 465
 MAIL_USE_TLS = False
 MAIL_USE_SSL = True
 MAIL_DEBUG = False
 
 # gmail authentication
-MAIL_USERNAME = os.environ['MAILGUN_SMTP_LOGIN']
-MAIL_PASSWORD = os.environ['MAILGUN_SMTP_PASSWORD']
+MAIL_USERNAME = os.environ['APP_MAIL_USERNAME']
+MAIL_PASSWORD = os.environ['APP_MAIL_PASSWORD']
 
 # mail accounts
 MAIL_DEFAULT_SENDER = 'final.iot.backend.mailer@gmail.com'