code: function (rawEmail, callback) {
          if (!isPythonAvailable) {
              return callback(null, false);
          }
  
          var verifyDkimPath = path.join(__dirname, '../python/verifydkim.py');
          var verifyDkim = child_process.spawn('python', [verifyDkimPath]);
  
          verifyDkim.stdout.on('data', function (data) {
              logger.verbose(data.toString());
          });
  
          verifyDkim.on('close', function (code) {
              logger.verbose('closed with return code ' + code);
              /* Convert return code to appropriate boolean. */
              return callback(null, !!!code);
          });
  
          verifyDkim.stdin.write(rawEmail);
          verifyDkim.stdin.end();
      }
docs: /* @param rawEmail is the full raw mime email as a string.