if (content instanceof final Multipart multipart) {
                final int count = multipart.getCount();
                for (int i = 0; i < count; i++) {
                    final BodyPart bodyPart = multipart.getBodyPart(i);
                    if (Part.ATTACHMENT.equalsIgnoreCase(bodyPart.getDisposition())) {
                        appendAttachment(buf, bodyPart);