diff --git a/lib/appenders/smtp.js b/lib/appenders/smtp.js
index e547b8a..3947181 100644
--- a/lib/appenders/smtp.js
+++ b/lib/appenders/smtp.js
@@ -1,120 +1,122 @@
 "use strict";
 var layouts = require("../layouts")
-, mailer = require("nodemailer")
-, os = require('os')
-, async = require('async')
-, unsentCount = 0
-, shutdownTimeout;
+        , mailer = require("nodemailer")
+        , os = require('os')
+        , async = require('async')
+        , unsentCount = 0
+        , shutdownTimeout;
 
 /**
-* SMTP Appender. Sends logging events using SMTP protocol. 
-* It can either send an email on each event or group several 
-* logging events gathered during specified interval.
-*
-* @param config appender configuration data
-*    config.sendInterval time between log emails (in seconds), if 0
-*    then every event sends an email
-*    config.shutdownTimeout time to give up remaining emails (in seconds; defaults to 5).
-* @param layout a function that takes a logevent and returns a string (defaults to basicLayout).
-*/
+ * SMTP Appender. Sends logging events using SMTP protocol. 
+ * It can either send an email on each event or group several 
+ * logging events gathered during specified interval.
+ *
+ * @param config appender configuration data
+ *    config.sendInterval time between log emails (in seconds), if 0
+ *    then every event sends an email
+ *    config.shutdownTimeout time to give up remaining emails (in seconds; defaults to 5).
+ * @param layout a function that takes a logevent and returns a string (defaults to basicLayout).
+ */
 function smtpAppender(config, layout) {
-	layout = layout || layouts.basicLayout;
-	var subjectLayout = layouts.messagePassThroughLayout;
-	var sendInterval = config.sendInterval*1000 || 0;
-	
-	var logEventBuffer = [];
-	var sendTimer;
-	
-	shutdownTimeout = ('shutdownTimeout' in config ? config.shutdownTimeout : 5) * 1000;
-	
-	function sendBuffer() {
-    if (logEventBuffer.length > 0) {
-		
-      var transportOpts = getTransportOptions(config);
-      var transport = mailer.createTransport(transportOpts);
-      var firstEvent = logEventBuffer[0];
-      var body = "";
-      var count = logEventBuffer.length;
-      while (logEventBuffer.length > 0) {
-        body += layout(logEventBuffer.shift(), config.timezoneOffset) + "\n";
-      }
+    layout = layout || layouts.basicLayout;
+    var subjectLayout = layouts.messagePassThroughLayout;
+    var sendInterval = config.sendInterval * 1000 || 0;
 
-      var msg = {
-        to: config.recipients,
-        subject: config.subject || subjectLayout(firstEvent),
-        headers: { "Hostname": os.hostname() }
-      };
-	  
-      if (!config.html) {
-	msg.text = body;
-      } else {
-    	msg.html = body;
-      }
-      
-      if (config.sender) {
-        msg.from = config.sender;
-      }
-      transport.sendMail(msg, function(error, success) {
-        if (error) {
-          console.error("log4js.smtpAppender - Error happened", error);
+    var logEventBuffer = [];
+    var sendTimer;
+
+    shutdownTimeout = ('shutdownTimeout' in config ? config.shutdownTimeout : 5) * 1000;
+
+    function sendBuffer() {
+        if (logEventBuffer.length > 0) {
+
+            var transportOpts = getTransportOptions(config);
+            var transport = mailer.createTransport(transportOpts);
+            var firstEvent = logEventBuffer[0];
+            var body = "";
+            var count = logEventBuffer.length;
+            while (logEventBuffer.length > 0) {
+                body += layout(logEventBuffer.shift(), config.timezoneOffset) + "\n";
+            }
+
+            var msg = {
+                to: config.recipients,
+                subject: config.subject || subjectLayout(firstEvent),
+                headers: {"Hostname": os.hostname()}
+            };
+
+            if (!config.html) {
+                msg.text = body;
+            } else {
+                msg.html = body;
+            }
+
+            if (config.sender) {
+                msg.from = config.sender;
+            }
+            transport.sendMail(msg, function (error, success) {
+                if (error) {
+                    console.error("log4js.smtpAppender - Error happened", error);
+                }
+                transport.close();
+                unsentCount -= count;
+            });
         }
-        transport.close();
-        unsentCount -= count;
-      });
     }
-	}
-	
-	function scheduleSend() {
-		if (!sendTimer) {
-			sendTimer = setTimeout(function() {
-				sendTimer = null; 
-				sendBuffer();
-			}, sendInterval);
+
+    function scheduleSend() {
+        if (!sendTimer) {
+            sendTimer = setTimeout(function () {
+                sendTimer = null;
+                sendBuffer();
+            }, sendInterval);
+        }
     }
-	}
-	
-	function getTransportOptions(config) {
+
+    function getTransportOptions(config) {
         var transportOpts = null;
-        if( config.SMTP ) {
+        if (config.SMTP) {
             transportOpts = config.SMTP;
-        } else if( config.transport ) {
+        } else if (config.transport) {
             var plugin = config.transport.plugin || 'smtp';
             var transportModule = 'nodemailer-' + plugin + '-transport';
-            var transporter = require( transportModule );
-            transportOpts = transporter( config.transport.options );
+            var transporter = require(transportModule);
+            transportOpts = transporter(config.transport.options);
         }
 
         return transportOpts;
-	}
-	
-	return function(loggingEvent) {
-		unsentCount++;
-		logEventBuffer.push(loggingEvent);
-		if (sendInterval > 0) {
-			scheduleSend();
-		} else {
-			sendBuffer();
     }
-	};
+
+    return function (loggingEvent) {
+        unsentCount++;
+        logEventBuffer.push(loggingEvent);
+        if (sendInterval > 0) {
+            scheduleSend();
+        } else {
+            sendBuffer();
+        }
+    };
 }
 
 function configure(config) {
-	var layout;
-	if (config.layout) {
-		layout = layouts.layout(config.layout.type, config.layout);
-	}
-	return smtpAppender(config, layout);
+    var layout;
+    if (config.layout) {
+        layout = layouts.layout(config.layout.type, config.layout);
+    }
+    return smtpAppender(config, layout);
 }
 
 function shutdown(cb) {
-	if (shutdownTimeout > 0) {
-		setTimeout(function() { unsentCount = 0; }, shutdownTimeout);
-	}
-	async.whilst(function() {
-		return unsentCount > 0;
-	}, function(done) {
-		setTimeout(done, 100);
-	}, cb);
+    if (shutdownTimeout > 0) {
+        setTimeout(function () {
+            unsentCount = 0;
+        }, shutdownTimeout);
+    }
+    async.whilst(function () {
+        return unsentCount > 0;
+    }, function (done) {
+        setTimeout(done, 100);
+    }, cb);
 }
 
 exports.name = "smtp";