What role does network configuration play in PHP mail sending errors?

Network configuration plays a crucial role in PHP mail sending errors because it determines the ability of the server to connect to an SMTP server and send emails. If the network configuration is incorrect or blocked, PHP may not be able to send emails successfully. To solve this issue, ensure that the server's network configuration allows outbound connections on the SMTP port (usually port 25 or 587) and that any firewalls or security settings do not block the connection.

// Example PHP code snippet to set up mail configuration with SMTP server
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";

// Set up SMTP server configuration
ini_set("SMTP", "smtp.example.com");
ini_set("smtp_port", "587");

// Send email
if (mail($to, $subject, $message)) {
    echo "Email sent successfully.";
} else {
    echo "Failed to send email.";
}