Hi, I used following code ...

 use strict;
 use warnings;
 use Net::SMTP::TLS;
 my $mailer = new Net::SMTP::TLS(
        'smtp.gmail.com',
        Hello   =>      'localhost',
        Port    =>      25, #redundant
        Timeout =>      30,
        User    =>      'kimuthuselvan@gmail.com',
        Password=>      '********');

 $mailer->mail('kimuthuselvan@gmail.com');
 $mailer->to('kimuthuselvan@hotmail.com');
 $mailer->data;
 $mailer->datasend("Sent thru TLS!");
 $mailer->dataend;
 $mailer->quit;
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but it is not working for me. The error message is

*******************************************************************
 Using the default of SSL_verify_mode of SSL_VERIFY_NONE for client
 is deprecated! Please set SSL_verify_mode to SSL_VERIFY_PEER
 together with SSL_ca_file|SSL_ca_path for verification.
 If you really don't want to verify the certificate and keep the
 connection open to Man-In-The-Middle attacks please set
 SSL_verify_mode explicitly to SSL_VERIFY_NONE in your application.
*******************************************************************
  at C:/Apps/Perl64/site/lib/Net/SMTP/TLS.pm line 181.
invalid SSL_version specified at C:/Apps/Perl64/lib/IO/Socket/SSL.pm l
+ine 389.
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Please help me to fix this issue. Thank you.