What are some common reasons for the PHP mail function to stop working suddenly?

One common reason for the PHP mail function to stop working suddenly is misconfigured mail server settings. Ensure that the SMTP server, port, username, and password are correctly set in the php.ini file or within the mail function parameters. Additionally, check for any firewall or security settings that may be blocking outgoing mail. It's also important to verify that the recipient's email address is valid and the message content is properly formatted. 

// Example code snippet to set up PHP mail function with correct SMTP server settings
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
$headers = "From: sender@example.com";

ini_set("SMTP", "mail.example.com");
ini_set("smtp_port", "25");
ini_set("sendmail_from", "sender@example.com");

// Send mail
$mail_sent = mail($to, $subject, $message, $headers);

if ($mail_sent) {
    echo "Mail sent successfully";
} else {
    echo "Mail delivery failed";
}

Keywords

PHP mail function SMTP server mail configuration spam folder error logs

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