What are the potential pitfalls of using email addresses with special characters, such as umlauts, in PHP Swiftmailer?

Special characters, such as umlauts, in email addresses can cause issues with encoding and validation in PHP Swiftmailer. To avoid potential pitfalls, it is recommended to properly encode the email address using UTF-8 encoding before sending it with Swiftmailer. This ensures that the email address is correctly formatted and can be processed by the email server without any errors. 

$email = 'example@domain.com'; // email address with special characters
$encodedEmail = mb_encode_mimeheader($email, 'UTF-8', 'Q'); // encode email address using UTF-8
$message = (new Swift_Message())
    ->setSubject('Subject')
    ->setFrom(['sender@example.com' => 'Sender'])
    ->setTo([$encodedEmail => 'Recipient'])
    ->setBody('Email body');

$transport = new Swift_SmtpTransport('smtp.example.com', 25);
$mailer = new Swift_Mailer($transport);
$mailer->send($message);

Keywords

PHP Swiftmailer email addresses special characters umlauts

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