php mail() is not working in xampp with gmail SMTP

Question

I just don't know why this is not working! I've spent more than 4 hours trying to figure out what is the problem but no luck :(((

here is my setting:

php.ini

[mail function]

SMTP = smtp.gmail.com
smtp_port = 587
sendmail_from = MY_EMAIL_ADDRESS@gmail.com
sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"
mail.add_x_header=Off

---

sendmail.ini

[sendmail]

smtp_server=smtp.gmail.com
smtp_port=587
smtp_ssl=tls
error_logfile=error.log
debug_logfile=debug.log
auth_username=MY_EMAIL_ADDRESS@gmail.com
auth_password=MY_GMAIL_PASSWORD
pop3_server=
pop3_username=
pop3_password=
force_sender=
force_recipient=
hostname=

---

mailtest.php

<?php

mail("MY_OTHER_EMAIL_ADDRESS@gmail.com","test subject","test body","From: MY_GMAIL_ADDRESS@gmail.com");

?>

---

error.log

14-05-29 06:08:59 : Connection Closed Gracefully.

---

debug.log

14-05-29 06:08:56 ** --- MESSAGE BEGIN ---
14-05-29 06:08:56 ** To: MY_OTHER_EMAIL_ADDRESS@gmail.com
14-05-29 06:08:56 ** Subject: test subject
14-05-29 06:08:56 ** From: MY_GMAIL_ADDRESS@gmail.com
14-05-29 06:08:56 ** 
14-05-29 06:08:56 ** test body
14-05-29 06:08:56 ** --- MESSAGE END ---
14-05-29 06:08:59 ** Connecting to smtp.gmail.com:587
14-05-29 06:08:59 ** Connected.
14-05-29 06:08:59 << 220 mx.google.com ESMTP ds6sm39818521wjd.38 - gsmtp<EOL>
14-05-29 06:08:59 >> EHLO SultanHome<EOL>
14-05-29 06:08:59 << 250-mx.google.com at your service, [94.96.120.212]<EOL>250-SIZE 35882577<EOL>250-8BITMIME<EOL>250-STARTTLS<EOL>250 ENHANCEDSTATUSCODES<EOL>
14-05-29 06:08:59 ** Authenticating as MY_GMAIL_ADDRESS@gmail.com
14-05-29 06:08:59 >> STARTTLS<EOL>
14-05-29 06:08:59 << 220 2.0.0 Ready to start TLS<EOL>
14-05-29 06:08:59 >> QUIT<EOL>
14-05-29 06:08:59 <<  5  1S†¤Åý  ƒPwq6†­êýIˆ¡Êr¼¡L=;Y       ÿ   #     z0‚v0‚^ :ä^nìó0
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14-05-29 06:08:59 <<  F
14-05-29 06:08:59 ** Disconnected.
14-05-29 06:08:59 ** Disconnecting from smtp.gmail.com:587
14-05-29 06:08:59 ** Disconnected.
14-05-29 06:08:59 ** Disconnected.
14-05-29 06:08:59 ** Connection Closed Gracefully.

---

Please Note:

1. I've read most of the questions and answers here but non of them worked for me!
2. After modification, I've stopped and restarted the Apache Server
3. I've added my GMAIL account in MS outlook 2010 and I'm able to connect, receive, and send emails
4. My XAMPP version is: 1.8.2
5. My PHP version is: PHP 5.4.19 (VC9 X86 32bit thread safe) + PEAR

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Your help will be so appreciated...