How can dynamic IP addresses from ISPs like Telekom impact email delivery when using PHP to send emails?

Dynamic IP addresses from ISPs like Telekom can impact email delivery when sending emails using PHP because many email servers use blacklists to block emails from dynamic IP addresses. To ensure reliable email delivery, consider using a reputable email delivery service like SendGrid or Amazon SES, which provide dedicated IP addresses for sending emails. This will help improve email deliverability and avoid being blocked by recipient email servers.

// Example PHP code using SendGrid to send emails
require 'vendor/autoload.php'; // Include SendGrid library

$sendgrid = new SendGrid('YOUR_SENDGRID_API_KEY'); // Initialize SendGrid with your API key
$email = new SendGrid\Email(); // Create a new email

$email
    ->addTo('recipient@example.com')
    ->setFrom('sender@example.com')
    ->setSubject('Subject of the email')
    ->setText('Body of the email')
    ->setHtml('<strong>HTML body of the email</strong>');

$response = $sendgrid->send($email); // Send the email

if ($response->message == 'success') {
    echo 'Email sent successfully';
} else {
    echo 'Failed to send email';
}