class.upload.php is a powerful and mature PHP class to manage uploaded files, and manipulate images in many ways. The script is available under a GPL license.
more info about the class
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$handle->allowed[] = 'message/rfc822';
Here, you log shows that the file you try to upload has a MIME type which is message/rfc822
For instance, add it to the allowed parameter of the class, before you call process():