I have a pop account (prem.mishra@abc.com)  I sent an email to ramesh.s@xyz.com which is having exchange account.

How the email will flow from my organization to recipient organization.

Please explain me.

Hello

tip: start exchange management shell

and get-messagetrackinglog -sender prem.mishra@abc.com -recipient ramesh.s@xyz.com |out-gridview

read this

http://www.msexchange.org/articles-tutorials/exchange-server-2013/planning-architecture/exchange-2013-mail-flow-part1.html