Are there any best practices or guidelines for setting the From address in PHPMailer when sending emails via GMX to avoid delivery issues?

When sending emails via GMX using PHPMailer, it's important to set the From address to a valid email address that belongs to the domain you are sending from. This helps prevent delivery issues such as emails being marked as spam or not being delivered at all. Make sure to authenticate your SMTP connection and use proper headers to ensure successful delivery. 

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

// Create a new PHPMailer instance
$mail = new PHPMailer(true);

try {
    //Server settings
    $mail->isSMTP();
    $mail->Host = 'smtp.gmx.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your_email@gmx.com';
    $mail->Password = 'your_password';
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
    $mail->Port = 587;

    //Recipients
    $mail->setFrom('your_email@gmx.com', 'Your Name');
    $mail->addAddress('recipient@example.com', 'Recipient Name');

    //Content
    $mail->isHTML(true);
    $mail->Subject = 'Subject';
    $mail->Body = 'Email body';

    $mail->send();
    echo 'Email sent successfully';
} catch (Exception $e) {
    echo "Email could not be sent. Mailer Error: {$mail->ErrorInfo}";
}

Keywords

PHPMailer GMX From address delivery issues guidelines

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