IN あなたの localconf.php に追加
$TYPO3_CONF_VARS['MAIL']['transport'] = 'smtp';
$TYPO3_CONF_VARS['MAIL']['transport_smtp_server'] = 'smtp.gmail.com:465';
$TYPO3_CONF_VARS['MAIL']['transport_smtp_port'] = '465';
$TYPO3_CONF_VARS['MAIL']['transport_smtp_encrypt'] ='ssl'; # requires openssl in PHP
$TYPO3_CONF_VARS['MAIL']['transport_smtp_username'] = '*****@gmail.com';
$TYPO3_CONF_VARS['MAIL']['transport_smtp_password'] = '*****';
次に、phpファイルで使用します
$mailContent = $mailcontent;
$mailContent = ($mailContent);
// Create the Mailer using your created Transport
$mail = t3lib_div::makeInstance('t3lib_mail_Message');
$mail->setFrom(array('sender email' => 'sender name'));
//$mail->setBcc(array($this->bcc => $this->bcc));
$mail->setSubject($subject);
$mail->setBody($mailContent,'text/html');
$mail->setTo(array('reciever email' => 'name'));
$mail->send();