What are common issues when trying to send mail using sendmail on a Linux server?

Common issues when trying to send mail using sendmail on a Linux server include misconfigured sendmail settings, firewall restrictions blocking outgoing mail, and incorrect permissions on the sendmail executable. To solve these issues, ensure that the sendmail configuration file is correctly set up, check firewall rules to allow outgoing mail, and verify that the sendmail executable has the proper permissions. 

// Example PHP code snippet to send an email using sendmail
$to = 'recipient@example.com';
$subject = 'Test Email';
$message = 'This is a test email sent using sendmail on a Linux server';
$headers = 'From: sender@example.com';

// Send the email using sendmail
if (mail($to, $subject, $message, $headers)) {
    echo 'Email sent successfully';
} else {
    echo 'Email sending failed';
}

Keywords

sendmail Linux server mail sending PHP error types

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