Custom senderHeader not working for receiver

[frpuser]

Custom receiver.senderHeader.name and receiver.senderHeader.email not working due to this line: $senderHeaderConfig = $this->settings['receiver.']['senderHeader.']??[]; in SendMailService.php on Line 344

$this->settings does not need dots like $this->configuration.

Possible fixes would be: $senderHeaderConfig = $this->configuration['receiver.']['senderHeader.']??[]; or $senderHeaderConfig = $this->settings['receiver']['senderHeader']??[];