Not able to send out internet emails. Not able to receive emails yet!

Hello all

Little background.  my company is currently using 2 companies to host our emails.  bluehost has our domain and x7hosting has our emails.  It is a simple pop email service.  We want to change over to exchange so we purchased a server that will act as a file server and a exchange server.  About 1 month ago I set up exchange server and was able to sent out emails with no issues but was not able to receive emails due to x7hosting still holding on to our domain. flash forward to today we want to redirect our domain to our in house server with exchange.  OUT of the blue i am no longer able to send out emails. we have not yet redirected our domain to our server but we would like to do so ASAP.  currently our emails are staying in our drafts.

i have gone through multiple forums but cannot find any luck