In what situations would using /usr/bin/sendmail for sending emails be preferable over SMTP when using a PHP mailer like PHPMailer?

Using /usr/bin/sendmail for sending emails can be preferable over SMTP when using a PHP mailer like PHPMailer if you want to send emails directly from the server without relying on an external SMTP server. This can be useful for sending emails quickly and efficiently, especially for transactional emails or notifications that do not require complex formatting or authentication. 

// Example PHP code snippet using /usr/bin/sendmail with PHPMailer

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;

// Instantiate PHPMailer
$mail = new PHPMailer();

// Set the mailer to use the /usr/bin/sendmail
$mail->isSendmail();

// Set the recipient, subject, and body of the email
$mail->setFrom('from@example.com', 'Sender Name');
$mail->addAddress('recipient@example.com', 'Recipient Name');
$mail->Subject = 'Test Email';
$mail->Body = 'This is a test email sent using /usr/bin/sendmail';

// Send the email
if(!$mail->send()) {
    echo 'Email could not be sent.';
    echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
    echo 'Email has been sent';
}

Keywords

/usr/bin/sendmail SMTP PHPMailer email sending preference

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