如何解决：无法使用PHP中的主机smtp.gmail.com [连接超时＃110]错误建立连接

Question

I'm trying to set up an email verification system for a login system that I am working on. I've got mostly everything working in my php code, up until the $mailer->send($message) line which returns the above error.

I've looked at several other similar issues on stackoverflow and other sites, but none of the proposed solutions have worked. I have less secure apps enabled on the gmail account that is sending the verification email. I've tried ssl and tls with ports 465 and 587 respectively. I don't wish to disable anything security related unnecessarily. While I am fairly confident in my coding knowledge, I'm afraid I have very little experience with server related issues like this. I've created a login system with email verification successfully in the past, but I don't remember how I avoided this issue. If this is related to firewalls or something like that, I only ask for a little more information as one can assume I'm essentially a layman in that area.

<?php
require_once './vendor/autoload.php';

function sendVerificationEmail($userEmail, $verificationCode)
{
$transport = (new Swift_SmtpTransport('smtp.gmail.com', 465, 'ssl'))
->setUsername("[e-mail]")
->setPassword("password");

$mailer = new Swift_Mailer($transport);
$body = "";
    $message = (new Swift_Message('Verify your email'))
        ->setFrom("[e-mail]")
        ->setTo($userEmail)
        ->setBody($body);

    echo "Message Created. Send To: " . $userEmail;
    try
    {
      if ($mailer->send($message, $errors))
      {
        echo "email success.";
        return true;
      }
      else
      {
        echo "email no good.";
        echo "ERROR: " . $errors;
        return false;
      }
    }
    catch(Swift_SwiftException $e)
    {
      echo "ERROR: " . $e->getMessage();
    }
}

?>

Much of this code is derived from the standard tutorials. I'm just trying to make sure an email is sent before I actually include the functionality for verification. I do not know why this is not sending an email. It's specifically returning the 'Connection could not be established with host smtp.gmail.com [Connection timed out #110]' error.

Thank you for your time.

Answer 1

I eventually worked around the issue by using an SMTP plugin for Wordpress (WP Mail SMTP), where the page and login system are hosted. It used some of the 0Auth2 stuff I set up, so I didn't completely waste my efforts. Thank you all for your time and help.