What are the potential pitfalls of using the mail() function in PHP for sending newsletters?

One potential pitfall of using the mail() function in PHP for sending newsletters is that it can be inefficient and slow when sending a large number of emails. To improve performance, you can use a third-party email service provider like SendGrid or Mailgun, which are specifically designed for sending bulk emails. 

// Example of sending newsletters using SendGrid API

$sendgrid_api_key = 'YOUR_SENDGRID_API_KEY';
$email = 'recipient@example.com';
$subject = 'Newsletter Subject';
$message = 'Newsletter Content';

$url = 'https://api.sendgrid.com/v3/mail/send';

$data = array(
    'personalizations' => array(
        array(
            'to' => array(
                array(
                    'email' => $email
                )
            )
        )
    ),
    'from' => array(
        'email' => 'sender@example.com'
    ),
    'subject' => $subject,
    'content' => array(
        array(
            'type' => 'text/plain',
            'value' => $message
        )
    )
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Authorization: Bearer ' . $sendgrid_api_key,
    'Content-Type: application/json'
));

$result = curl_exec($ch);
curl_close($ch);

echo $result;

Keywords

mail function PHP newsletters spam folder deliverability

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