% tar xzvf textile-x.x.x.tar.gz
% mv textile /path/to/drupal/modules

# GmailのSMTPサーバを指定
relayhost = [smtp.gmail.com]:587

# TLSにより暗号化
smtp_use_tls = yes

# plain方式の SMTP AUTH認証を有効にする
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_tls_security_options = noanonymous
smtp_sasl_mechanism_filter = plain

# GmailのTLS証明書の妥当性確認のための設定
smtp_tls_CApath = /etc/pki/tls/certs/ca-bundle.crt

[smtp.gmail.com]:587 username@gmail.com:password

# chown root:root /etc/postfix/sasl_passwd
# chmod 600 /etc/postfix/sasl_passwd

/usr/share/ca-certificates/thawte.com/Thawte SSLWeb Server Roots/thawte Premium Server CA/Thawte Premium Server CA.pem

<?php
mb_language("japanese");
mb_internal_encoding("UTF-8");

require("class.phpmailer.php");
$mailer = new PHPMailer();
$mailer->IsSMTP();
$mailer->Host = 'ssl://smtp.gmail.com:465';
$mailer->SMTPAuth = TRUE;
$mailer->Username = 'user@gmail.com';  // Gmailのアカウント名
$mailer->Password = 'gmail_password';  // Gmailのパスワード
$mailer->From     = 'from@gmail.com';  // Fromのメールアドレス
$mailer->FromName = mb_encode_mimeheader(mb_convert_encoding("Fromの名前","JIS","UTF-8"));
$mailer->Subject  = mb_encode_mimeheader(mb_convert_encoding("メールのタイトル","JIS","UTF-8"));
$mailer->Body     = mb_convert_encoding("メールの内容","JIS","UTF-8");
$mailer->AddAddress('friend@example.com'); // 宛先
// $mailer->AddReplyTo($email, $from);

if(!$mailer->Send()) {
   echo "Message was not sent<br/ >";
   echo "Mailer Error: " . $mailer->ErrorInfo;
} else {
   echo "Message has been sent";
}
?>

<?php
mb_language("japanese");
mb_internal_encoding("UTF-8");

require_once 'Mail.php';

$params = array(
  'host'     => 'smtp.gmail.com',
  'port'     => 587,
  'auth'     => true,
  'username' => 'example@gmail.com',
  'password' => 'password',
  'debug'    => true,
);

$headers = array(
  'From'    => 'example@gmail.com',
  'To'      => 'example@gmail.com',
  'Subject' => mb_encode_mimeheader(mb_convert_encoding("メールのタイトル","JIS","UTF-8"))
);

$recipients = 'example@gmail.com';
$body = mb_convert_encoding("メールの内容","JIS","UTF-8");

$smtp = Mail::factory('smtp', $params);
$e = $smtp->send($recipients, $headers, $body);

if ( PEAR::isError($e) ) echo $e->getMessage() . "\n";
?>

$params = array(
	'host'     => 'tls://smtp.gmail.com',
	'port'     => 465,
	'auth'     => true,
	'username' => 'account', // @より左部分のみ
	'password' => 'password',
	'debug'    => false,
	'protocol'=>'SMTP_AUTH'
);

$params = array(
	'host'     => 'secure.plala.or.jp',
	'port'     => 25,
	'auth'     => true,
	'username' => 'account@subdomain.plala.or.jp',
	'password' => 'password',
	'debug'    => true, // false
	'protocol'=>'SMTP_AUTH'
);