(I was having the same errors you were)
The BasicTransport
didn't have the right "pre-processing" nor the appropriate response handling.
I copied over the functionality from CurlTransport
and it works for me now.
Specifically, we needed:
$post = array();
$post_preprocess = array_merge(
$email->getHeaders(array('from', 'sender', 'replyTo', 'readReceipt', 'returnPath', 'to', 'cc', 'bcc', 'subject')),
array(
'text' => $email->message(CakeEmail::MESSAGE_TEXT),
'html' => $email->message(CakeEmail::MESSAGE_HTML)
)
);
foreach ($post_preprocess as $k => $v) {
if (! empty($v)) {
$post[strtolower($k)] = $v;
}
}
and then:
$response = $http->post($url, $post, $request);
if ($response === false) {
throw new SocketException("Mailgun BasicTransport error, no response", 500);
}
$http_status = $response->code;
if ($http_status != 200) {
throw new SocketException("Mailgun request failed. Status: $http_status, Response: {$response->body}", 500);
}