Why Can't I Send Emails via Gmail's SMTP Server with PHPMailer?

Unable to Send Email via Gmail's SMTP Server with PHPMailer: Resolving SMTP AUTH Issue

When attempting to utilize Gmail's SMTP server to transmit emails using PHPMailer, you may encounter the error, "SMTP AUTH is required for message submission on port 587." This error indicates the need for authentication before sending emails. Here's how to resolve this issue:

To rectify this, the following modifications are necessary:

$mail = new PHPMailer(); // New PHPMailer object
$mail->IsSMTP(); // Enable SMTP protocol
$mail->SMTPDebug = 1; // For debugging (log errors and messages)
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->SMTPSecure = 'ssl'; // Utilize Secure Socket Layer (SSL) for secure transmission (required for Gmail)
$mail->Host = "smtp.gmail.com";
$mail->Port = 465; // Or 587 depending on server settings
$mail->IsHTML(true); // Allow HTML-formatted emails
$mail->Username = "johndoe@gmail.com"; // Your Gmail username
$mail->Password = "mysecretpassword"; // Your Gmail password
$mail->SetFrom("sender@gmail.com"); // Set sender address
$mail->Subject = "Test Email";
$mail->Body = "Hello from PHPMailer!";
$mail->AddAddress("recipient@gmail.com"); // Add recipient address

if (!$mail->Send()) {
    echo "Mailer Error: " . $mail->ErrorInfo;
} else {
    echo "Email sent successfully!";
}

Key Considerations:

• Ensure that you have two-step verification disabled for the relevant Gmail account.
• Verify that your SMTP server supports SSL or TLS connections.
• If the issue persists, try adjusting the "SMTPSecure" setting to 'tls' instead of 'ssl'.

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