-layer=> 'ssl',
-port=> 465,
-debug=> 1,

You will get similar if it works:

Connecting to smtp.gmail.com using ssl with LOGIN
Net::SMTPS>>> Net::SMTPS(0.03)
Net::SMTPS>>>   IO::Socket::INET(1.31)
Net::SMTPS>>>     IO::Socket(1.32)
Net::SMTPS>>>       IO::Handle(1.31)
Net::SMTPS>>>         Exporter(5.64_03)
Net::SMTPS>>>   Net::SMTP(2.31)
Net::SMTPS>>>     Net::Cmd(2.29)
Net::SMTPS=GLOB(0x6003e5128)<<< 220 mx.google.com ESMTP b67sm22450316yhc.16 - gsmtp
Net::SMTPS=GLOB(0x6003e5128)>>> EHLO localhost.localdomain
Net::SMTPS=GLOB(0x6003e5128)<<< 250-mx.google.com at your service, [99.189.126.205]
Net::SMTPS=GLOB(0x6003e5128)<<< 250-SIZE 35882577
Net::SMTPS=GLOB(0x6003e5128)<<< 250-8BITMIME
Net::SMTPS=GLOB(0x6003e5128)<<< 250-AUTH LOGIN PLAIN XOAUTH XOAUTH2 PLAIN-CLIENTTOKEN
Net::SMTPS=GLOB(0x6003e5128)<<< 250-ENHANCEDSTATUSCODES
Net::SMTPS=GLOB(0x6003e5128)<<< 250 CHUNKING
Net::SMTPS=GLOB(0x6003e5128)>>> AUTH LOGIN
Net::SMTPS=GLOB(0x6003e5128)<<< 334 VXNlcm5hbWU6
Net::SMTPS=GLOB(0x6003e5128)>>> dGN4bmllbWFuQGdtYWlsLmNvbQ==
Net::SMTPS=GLOB(0x6003e5128)<<< 334 UGFzc3dvcmQ6
Net::SMTPS=GLOB(0x6003e5128)>>> bGE1dmVnYTU=
Net::SMTPS=GLOB(0x6003e5128)<<< 235 2.7.0 Accepted
Net::SMTPS=GLOB(0x6003e5128)>>> MAIL FROM:<mail@gmail.com>
Net::SMTPS=GLOB(0x6003e5128)<<< 250 2.1.0 OK b67sm22450316yhc.16 - gsmtp
Net::SMTPS=GLOB(0x6003e5128)>>> RCPT TO:<mail@xxx.com>
Net::SMTPS=GLOB(0x6003e5128)<<< 250 2.1.5 OK b67sm22450316yhc.16 - gsmtp
Net::SMTPS=GLOB(0x6003e5128)>>> DATA
Net::SMTPS=GLOB(0x6003e5128)<<< 354  Go ahead b67sm22450316yhc.16 - gsmtp
Net::SMTPS=GLOB(0x6003e5128)>>> From: address@gmail.com
Net::SMTPS=GLOB(0x6003e5128)>>> To: send_to@xxx.com
Net::SMTPS=GLOB(0x6003e5128)>>> Reply-To: address@gmail.com
Net::SMTPS=GLOB(0x6003e5128)>>> Subject: Hello!
Net::SMTPS=GLOB(0x6003e5128)>>> Date: Sun, 20 Jul 2014 08:53:59 -0500
Net::SMTPS=GLOB(0x6003e5128)>>> MIME-Version: 1.0
Net::SMTPS=GLOB(0x6003e5128)>>> Content-Type: text/html; charset=UTF-8
Net::SMTPS=GLOB(0x6003e5128)>>> Just testing it<br>Bye!
Net::SMTPS=GLOB(0x6003e5128)>>> .
Net::SMTPS=GLOB(0x6003e5128)<<< 250 2.0.0 OK 1405864442 b67sm22450316yhc.16 - gsmtp
Net::SMTPS=GLOB(0x6003e5128)>>> QUIT
Net::SMTPS=GLOB(0x6003e5128)<<< 221 2.0.0 closing connection b67sm22450316yhc.16 - gsmtp