Log4j2 using SMTP Appender- Mail is sent without body content(Blank mail)

Trying to send mail using Log4j2 SMTP Appender to log error events
But on error event Mail is sent but the content of the mail are blank always, please advice unable to understand this...

Below is the log4j2.xml configuration and SMTP DEBUG logs(email ids and host/user/passwords are changed below)

log4j2.xml :

<?xml version="1.0" encoding="UTF-8"?>

<Configuration status="TRACE">
<Properties>
<Property name="log-path">c:
test</Property> <!-- Local -->

</Properties>

<Appenders>

<SMTP name="Mailer"
smtpProtocol="smtps" smtpUsername="yog@gmail.com"
subject="Error Mail" to="yog@gmail.com" from="yog@gmail.com" smtpPassword="abc"
smtpHost="smtp.gmail.com" smtpPort="465"
bufferSize="1" smtpDebug="true" ignoreExceptions="false">
<!-ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY" /->
<!--<PatternLayout>
<pattern>%d

{yyyy-MM-dd HH:mm:ss}

%5p (%C:%M:%L) - %m%n</pattern>
</PatternLayout>-->
<HTMLLayout charset="UTF-8" title="Error Logs" contentType="text/html" />
</SMTP>
<Async name="AsyncMailer" bufferSize="1">
<AppenderRef ref="Mailer" />
</Async>
</Appenders>

<Loggers>

<Logger name="com.test" additivity="false">
<AppenderRef ref="AsyncMailer"/>
</Logger>

<Root level="debug">
<AppenderRef ref="AsyncMailer"/>
</Root>
</Loggers>
</Configuration>

SMTP DEBUG Logs :

Info: DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle]
Info: DEBUG SMTP: need username and password for authentication
Info: DEBUG SMTP: useEhlo true, useAuth true
Info: DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 465, isSSL true
Info: 220 smtp.gmail.com ESMTP v11sm3496663itf.6 - gsmtp
Info: DEBUG SMTP: connected to host "smtp.gmail.com", port: 465
Info: EHLO MUMCH-29666.tcil.com
Info: 250-smtp.gmail.com at your service, [14.141.26.106]
Info: 250-SIZE 35882577
Info: 250-8BITMIME
Info: 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
Info: 250-ENHANCEDSTATUSCODES
Info: 250-PIPELINING
Info: 250-CHUNKING
Info: 250 SMTPUTF8
Info: DEBUG SMTP: Found extension "SIZE", arg "35882577"
Info: DEBUG SMTP: Found extension "8BITMIME", arg ""
Info: DEBUG SMTP: Found extension "AUTH", arg "LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH"
Info: DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
Info: DEBUG SMTP: Found extension "PIPELINING", arg ""
Info: DEBUG SMTP: Found extension "CHUNKING", arg ""
Info: DEBUG SMTP: Found extension "SMTPUTF8", arg ""
Info: DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM
Info: DEBUG SMTP: AUTH LOGIN command trace suppressed
Info: DEBUG SMTP: AUTH LOGIN succeeded
Info: DEBUG SMTP: use8bit false
Info: MAIL FROM:<yog@gmail.com>
Info: 250 2.1.0 OK v11sm3496663itf.6 - gsmtp
Info: RCPT TO:<yog@gmail.com>
Info: 250 2.1.5 OK v11sm3496663itf.6 - gsmtp
Info: DEBUG SMTP: Verified Addresses
Info: DEBUG SMTP: yog@gmail.com
Info: DATA
Info: 354 Go ahead v11sm3496663itf.6 - gsmtp
Info: Date: Fri, 15 Dec 2017 12:00:09 +0530 (IST)
Info: From: yog@gmail.com
Info: To: yog@gmail.com
Info: Message-ID: <8185101.5.1513319409057@MUMCH-29666>
Info: Subject: Error Mail
Info: MIME-Version: 1.0
Info: Content-Type: multipart/mixed;
Info: boundary="----=_Part_4_18607454.1513319409057"
Info: .
Info: 250 2.0.0 OK 1513319463 v11sm3496663itf.6 - gsmtp
Info: DEBUG SMTP: message successfully delivered to mail server
Info: QUIT
Info: 221 2.0.0 closing connection v11sm3496663itf.6 - gsmtp