Headers should be in camel case

This should also extend to legacymailer

Great thanks. I thought we'd fixed this! We deliberately store the header in lower-case internally to avoid collisions/confusion if people mix up the case.

Symfony does the same: in Headers::add() there is

$name = strtolower($header->getName());
$this->headers[$name][] = $header;

What I rather carelessly didn't realise is that $header->getName() is still in camel case.

Fortunately, I think there is an easy fix. In Email::getSymfonyEmail(), add a call to ucwords:
$headers->addMailboxListHeader(ucwords($name, '-'), $value);

That's way better solution and fixes, the issue. Patch included and merge request created.

Thank you very much @jviitamaki,
I can confirm your simple patch fixes the "{{ getSender(message) }}" problem for me.
Best regards
Vit

Great thanks please can you add a comment "Convert headers to camel case" then I'll commit.

Thanks however I meant to add a comment in the code

  // Convert headers to camel case.
  $headers->addMailboxListHeader(ucwords($name, '-'), $value);

Great thanks everyone

Automatically closed - issue fixed for 2 weeks with no activity.