javascript - reading mail sequentially in mail-listener 2 node library -

There is no asset to set which enables the reader to read the mail in the mail-lessoner 2 module,

Use seq no in any way

  mailListener.on ("mail", function (mail, seqno, attributes) {// mail attach some concrete console with mail .log ("Email Reader ", mail); // mail processing code goes here});  

How can I do this?