TYPO3 Core

t3lib_formmail tries to set a "Reply-To:" Header but fails doing so because of a wrong call of method "addReplyTo()" from swiftmailer.

The method "addReplyTo()" of class "t3lib_mail_Message" (which extends Swift_Message) expects to parameters of "string" type.
But t3lib_formmail sets an array as argument to "addReplyTo()".

Original Code (line 232...):
$replyTo = $this->replyToName ? array($this->replyToAddress => $this->replyToName) : array($this->replyToAddress);
$this->mailMessage->addReplyTo($replyTo);

This can be fixed by using this line instead:
$this->mailMessage->addReplyTo($this->replyToAddress, $this->replyToName);

(issue imported from #M17916)