MAGETWO-71718: \Magento\Email\Model\Transport contains logic which will be overriden by any 3dparty transport

Author: slavvka

app/code/Magento/Email/Model/Mail/TransportInterfacePlugin.php

@@ -17,11 +17,6 @@
  */
 class TransportInterfacePlugin
 {
-    /**
-     * Config path to mail sending setting that shows if email communications are disabled
-     */
-    const XML_PATH_SYSTEM_SMTP_DISABLE = 'system/smtp/disable';
-
     /**
      * @var ScopeConfigInterface
      */
@@ -49,7 +44,7 @@ public function aroundSendMessage(
         TransportInterface $subject,
         \Closure $proceed
     ) {
-        if (!$this->scopeConfig->isSetFlag(self::XML_PATH_SYSTEM_SMTP_DISABLE, ScopeInterface::SCOPE_STORE)) {
+        if (!$this->scopeConfig->isSetFlag('system/smtp/disable', ScopeInterface::SCOPE_STORE)) {
             $proceed();
         }
     }

app/code/Magento/Email/Model/Template.php

@@ -57,7 +57,6 @@ class Template extends AbstractTemplate implements \Magento\Framework\Mail\Templ
     /**
      * Config path to mail sending setting that shows if email communications are disabled
      * @deprecated
-     * @see \Magento\Email\Model\Mail\TransportInterfacePlugin::XML_PATH_SYSTEM_SMTP_DISABLE
      */
     const XML_PATH_SYSTEM_SMTP_DISABLE = 'system/smtp/disable';