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Postmark API mailer transport should exclude the Date header #60254

@rtek

Description

@rtek

Symfony version(s) affected

6.4.19

Description

When sending an email using the Postmark API transport, with a Date header set, postmark rejects the message, and the transport throws this exception:

Fatal error: Uncaught Symfony\Component\Mailer\Exception\HttpTransportException: 
Unable to send an email: Header 'Date' not allowed. (code 300). in
/vendor/symfony/postmark-mailer/Transport/PostmarkApiTransport.php:72

How to reproduce

$transport = new \Symfony\Component\Mailer\Bridge\Postmark\Transport\PostmarkApiTransport('***');
$email = new \Symfony\Component\Mime\Email();

$email->text(date('c'))
    ->to('foo@localhost')
    ->from('bar@localhost')
    ->date(new \DateTimeImmutable());

$transport->send($email);

//PHP Fatal error:  Uncaught Symfony\Component\Mailer\Exception\HttpTransportException: Unable to send an email: Header 'Date' not allowed. (code 300). in vendor/symfon/postmark-
mailer/Transpor/PostmarkApiTransport.php:72

Possible Solution

Fix is to add 'date' to this exclusion list: https://github.com/symfony/postmark-mailer/blob/7.2/Transport/PostmarkApiTransport.php#L113

Workaround is to remove the date header from the email before sending it.

Additional Context

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