Mailgun Webhook POST Request

mailgun.rb

{
  "Message-Id"=>"<20130503182626.18666.16540@barcelonites.com>",
  "X-Mailgun-Sid"=>"WyIwNzI5MCIsICJhbGljZUBleGFtcGxlLmNvbSIsICI2Il0=",
  "attachment-count"=>"1",
  "body-plain"=>"",
  "code"=>"550",
  "domain"=>"barcelonites.com",
  "error"=>"5.1.1 The email account that you tried to reach does not exist. Please try\n5.1.1 double-checking the recipient's email address for typos or\n5.1.1 unnecessary spaces. Learn more at\n5.1.1 http://support.example.com/mail/bin/answer.py",
  "event"=>"bounced",
  "message-headers"=>"[[\"Received\", \"by luna.mailgun.net with SMTP mgrt 8734663311733; Fri, 03 May 2013 18:26:27 +0000\"], [\"Content-Type\", [\"multipart/alternative\", {\"boundary\": \"eb663d73ae0a4d6c9153cc0aec8b7520\"}]], [\"Mime-Version\", \"1.0\"], [\"Subject\", \"Test bounces webhook\"], [\"From\", \"Bob <bob@barcelonites.com>\"], [\"To\", \"Alice <alice@example.com>\"], [\"Message-Id\", \"<20130503182626.18666.16540@barcelonites.com>\"], [\"List-Unsubscribe\", \"<mailto:u+na6tmy3ege4tgnldmyytqojqmfsdembyme3tmy3cha4wcndbgaydqyrgoi6wszdpovrhi5dinfzw63tfmv4gs43uomstimdhnvqws3bomnxw2jtuhusteqjgmq6tm@barcelonites.com>\"], [\"X-Mailgun-Sid\", \"WyIwNzI5MCIsICJhbGljZUBleGFtcGxlLmNvbSIsICI2Il0=\"], [\"X-Mailgun-Variables\", \"{\\\"my_var_1\\\": \\\"Mailgun Variable #1\\\", \\\"my-var-2\\\": \\\"awesome\\\"}\"], [\"Date\", \"Fri, 03 May 2013 18:26:27 +0000\"], [\"Sender\", \"bob@barcelonites.com\"]]",
  "my-var-2"=>"awesome",
  "my_var_1"=>"Mailgun Variable #1",
  "recipient"=>"alice@example.com",
  "signature"=>"9f0be5b57d8bdb97c8f2bb982629165366bd63d5a0f9f3a09653a54b49af272a",
  "timestamp"=>"1462978751",
  "token"=>"b2ad5a88f4aa8ac2f8f1172a717457064c7509ad2fa0e79ec1",
  "attachment-1"=>#<ActionDispatch::Http::UploadedFile:0x00000006749a18 @original_filename="message.mime", @content_type="application/octet-stream", @headers="Content-Disposition: form-data; name=\"attachment-1\"; filename=\"message.mime\"\r\nContent-Type: application/octet-stream\r\nContent-Length: 1187\r\n", @tempfile=#<File:/tmp/RackMultipart20160511-1863-1x703r1>>
}