What is the significance of SMTP authentication when sending emails using PHP?

SMTP authentication is important when sending emails using PHP because it ensures that the email server can verify the sender's identity before allowing the email to be sent. This helps prevent unauthorized users from sending spam or malicious emails through your server. By implementing SMTP authentication, you can increase the security of your email system and reduce the risk of your server being blacklisted. 

// Set SMTP authentication credentials
$mail->Username = 'your_smtp_username';
$mail->Password = 'your_smtp_password';
$mail->SMTPAuth = true;
$mail->SMTPSecure = 'tls';
$mail->Port = 587;

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SMTP authentication sending emails PHP significance security.

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