Generalized logs and mailer (#312)

sample.env

@@ -73,9 +73,11 @@ ALLOW_GREENLIGHT_ACCOUNTS=true
 # Set this to true if you want GreenLight to send verification emails upon
 # the creation of a new account
 #
-# SMTP variables can be configured by following the template:
-#
 #   ALLOW_MAIL_NOTIFICATIONS=true
+#
+# The notifications are sent using sendmail, unless the SMTP_SERVER variable is set.
+# In that case, make sure the rest of the variables are properly set.
+#
 #   SMTP_SERVER=smtp.gmail.com
 #   SMTP_PORT=587
 #   SMTP_DOMAIN=gmail.com
@@ -84,7 +86,6 @@ ALLOW_GREENLIGHT_ACCOUNTS=true
 #   SMTP_AUTH=plain
 #   SMTP_STARTTLS_AUTO=true
 #
-ALLOW_MAIL_NOTIFICATIONS=
 SMTP_SERVER=
 SMTP_PORT=
 SMTP_DOMAIN=
@@ -110,17 +111,24 @@ BRANDING_IMAGE=
 #
 # RAILS_LOG_TO_STDOUT=true
 #
-# When using docker-compose the logs can be sent to an external service like PaperTrail
+# When using docker-compose the logs can be sent to an centralized repository like PaperTrail
 # just by using the built in driver. Make sure to add to docker-compose.yml the next lines:
 #
 #     logging:
-#      driver: syslog
+#      driver: $LOG_DRIVER
 #      options:
-#        syslog-address: "tcp+tls://logs4.papertrailapp.com:[99999]"
-#        tag: greenlight.mydomain.com:v2
+#        syslog-address: $LOG_ADDRESS
+#        tag: $LOG_TAG
 #
-
-# Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
-# It is disabled by default.
+# And set this variables up:
+#
+# LOG_DRIVER=syslog
+# LOG_ADDRESS=udp://logs4.papertrailapp.com:[99999]
+# LOG_TAG=greenlight.example.com:v2
+#
+# Check docker-compose and papertrail documentation for encrypting and
+# protecting access to the log repository.
+# https://docs.docker.com/config/containers/logging/syslog/#options
+# https://help.papertrailapp.com/kb/configuration/encrypting-remote-syslog-with-tls-ssl/
 #
 # ENABLE_SSL=true