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We found a bug with the way Reply-To headers are set in MandrillController.php.
On line 76, there is a call to $phpmailer->getReplyToAddresses() that returns an associative array. On line 77, the condition checks it as if it is a standard array.
We were able to resolve it by changing line 76 to array_values($phpmailer->getReplyToAddresses()) , converting the associative array to a standard array.
This may be an issue with the other controllers as well; Mandrill is what we use so that’s where we found the bug.