I am using the latest version of PHPMailer 6.0.2 on LOCALHOST with Gmail SMTP Ports [ SSL on 465 and TLS 587 ]. It works well but not stable or works properly, very strange while OpenSSL Extension is also active in PHP Config /PHP.ini file.
It returns the error " SMTP Error: Could not connect to SMTP host ", sometimes on 465 or 587 port.
As right now it's on 587.
Here the exact error on port 587 ;
2017-12-05 13:00:26 Connection: opening to smtp.gmail.com:587, timeout=300, options=array ( 'ssl' => array ( 'verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true, ),) 2017-12-05 13:00:26 Connection: opened 2017-12-05 13:00:26 SMTP INBOUND: "220 smtp.gmail.com ESMTP f3sm245851pgt.15 - gsmtp" 2017-12-05 13:00:26 SERVER -> CLIENT: 220 smtp.gmail.com ESMTP f3sm245851pgt.15 - gsmtp 2017-12-05 13:00:26 CLIENT -> SERVER: EHLO localhost 2017-12-05 13:00:27 SMTP INBOUND: "250-smtp.gmail.com at your service, [110.36.136.72]" 2017-12-05 13:00:27 SMTP INBOUND: "250-SIZE 35882577" 2017-12-05 13:00:27 SMTP INBOUND: "250-8BITMIME" 2017-12-05 13:00:27 SMTP INBOUND: "250-STARTTLS" 2017-12-05 13:00:27 SMTP INBOUND: "250-ENHANCEDSTATUSCODES" 2017-12-05 13:00:27 SMTP INBOUND: "250-PIPELINING" 2017-12-05 13:00:27 SMTP INBOUND: "250-CHUNKING" 2017-12-05 13:00:27 SMTP INBOUND: "250 SMTPUTF8" 2017-12-05 13:00:27 SERVER -> CLIENT: 250-smtp.gmail.com at your service, [110.36.136.72]250-SIZE 35882577250-8BITMIME250-STARTTLS250-ENHANCEDSTATUSCODES250-PIPELINING250-CHUNKING250 SMTPUTF8 2017-12-05 13:00:27 CLIENT -> SERVER: STARTTLS 2017-12-05 13:00:27 SMTP INBOUND: "" 2017-12-05 13:00:27 SERVER -> CLIENT: 2017-12-05 13:00:27 SMTP ERROR: STARTTLS command failed: SMTP Error: Could not connect to SMTP host. 2017-12-05 13:00:27 SMTP NOTICE: EOF caught while checking if connected 2017-12-05 13:00:27 Connection: closed SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting Mailer Error: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting HERE IS THE RELEVANT CODE:
use PHPMailer\PHPMailer\PHPMailer; use PHPMailer\PHPMailer\OAuth; use League\OAuth2\Client\Provider\Google; require '../../vendor/autoload.php'; $mail = new PHPMailer; $mail->isSMTP(); $mail->SMTPDebug = 4; $mail->Host = 'smtp.gmail.com'; $mail->Port = 587; $mail->SMTPSecure = 'tls'; $mail->SMTPAuth = true; $mail->SMTPAutoTLS = false; $mail->SMTPOptions = array( 'ssl' => array( 'verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true ) ); $mail->Username = $from_address; $mail->Password = $from_password; $mail->SetLanguage("tr", "phpmailer/language"); $mail->CharSet = "utf-8"; $mail->Encoding = "base64"; $mail->SetFrom($from_address, $from_name); foreach ($to_email_list as $to) { $mail->AddAddress($to); } $mail->AddReplyTo($from_address, $from_name); $mail->Subject = $email_subject; //Creating Email Body $message = "<html>\n"; $message .= "<body>\n"; $message .= '<p>Greetings,</p>'; $message .= '<p>' . $email_message . '</p>'; $message .= "</body>\n"; $message .= "</html>\n"; $mail->isHTML(true); $mail->MsgHTML($message); if(!$mail->Send()) { echo "On Port: " . $from_smtp_port . " </br> Mailer Error: " . $mail->ErrorInfo; } else { echo "Message sent! on Port " . $from_smtp_port . "</br>"; foreach($to_email_list as $list){ echo $list . "</br>"; } }