We are performing an upgradev from exchange 2007 to exchange 2013
mail flows from 2013 to 2007 correctly
but when mails are sent from 2007 to 2013 the mails arent recived
I looked at message tracking and it seems there is not attempt from 2007 to send the mails to 2013
i have checked the frontend recive connector on 2013 and it has the exchange servers (and legacy) checked as well as echange authentication