(0 or 1) Specifies whether or not to convert email notifications to SMS notifications. Email notification messages must conform to RFCs 1892, 1893, 1894. The default value is 0.
When GATEWAY_NOTIFICATIONS=0, such notifications are discarded and are not converted to SMS notifications.
To enable the notifications to be converted to SMS notifications, set GATEWAY_NOTIFICATIONS=1. When the option set to 1, the localization options (DSN_*_FORMAT) control which notification types (success, failure, delay, relayed) are converted into SMS messages and sent through the gateway. (If the notification type has a value of an empty string, then that type notification is not converted into SMS messages.)