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para saber el tipo MIME del attachment

- (NSString *)guessMIMETypeFromFileName: (NSString *)fileName {
	// Borrowed from http://stackoverflow.com/questions/2439020/wheres-the-iphone-mime-type-database
	CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)[fileName pathExtension], NULL);
	CFStringRef MIMEType = UTTypeCopyPreferredTagWithClass(UTI, kUTTagClassMIMEType);
	CFRelease(UTI);
	if (!MIMEType) {
		return @"application/octet-stream";
	}
	return (__bridge NSString *)(MIMEType);
}