PHP: SMTP over SSL でメールの送信

こちらのプログラムを改造しました。
PHP: PHPMailer の使い方

Port は、465 です。

プログラム

phpmailer_smtp_ssl.php

#! /usr/bin/php

<?php
// ------------------------------------------------------------------
//	phpmailer_smtp_env.php
//
//				        Jan/08/2024
//
// ------------------------------------------------------------------
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;
require_once '/usr/share/php/libphp-phpmailer/autoload.php';
require_once '/usr/share/php/Dotenv/autoload.php';

$dotenv = Dotenv\Dotenv::createImmutable(__DIR__);
$dotenv->load();

$from = $_ENV['FROM'];
$to = $_ENV['TO'];

date_default_timezone_set('Asia/Tokyo');
$today = date ("Y-m-d");
$now = date("Y年m月d日 H時i分s秒");


$mailer = new PHPMailer;

$mailer->IsSMTP();
$mailer->Host = $_ENV['SERVER'];
$mailer->SMTPAuth = true;
$mailer->Username = $_ENV['USR'];
$mailer->Password = $_ENV['PASSWORD'];
$mailer->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;
// $mailer->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
$mailer->Port = $_ENV['PORT'];

$mailer->CharSet = 'utf-8';

$str_out = "";
$str_out .= 'This is TEST.' . PHP_EOL;
$str_out .= 'こんにちは。' . PHP_EOL;
$str_out .= '晴れています。' . PHP_EOL;
$str_out .= $today . PHP_EOL;
$str_out .= $now . PHP_EOL;

$mailer->setFrom($from);
$mailer->addAddress($to);
$mailer->Subject = 'Test Jan/08/2024 ' . date ("H:i:s") ;
$mailer->Body = $str_out;

if(!$mailer->send()) {
	echo 'Email is not sent.\n';
	echo 'Email error: ' . $mailer->ErrorInfo;
} else {
	echo '*** Email has been sent. ***' . PHP_EOL;
}

// ------------------------------------------------------------------
?>

.env

SERVER = 'mail.aaaa.co.jp'
PORT = 465
USR = '****@aaaa.co.jp'
PASSWORD = '****'
FROM = '****@aaaa.co.jp'
TO = '[e-mail]'