Email is not being recived from a number or domains

Email is not being recived from a number or domains

Email from a number of domains is not being delivered. Including the one I`m currently consulting for.. 
13:52:14.807 TX: <250 recipient ok <carrot@toplevelconsultancy.co.uk>>
13:52:14.807 RX: <DATA>
13:52:14.807 TX: <354 send the mail data, end with .>
13:52:14.807 Message data received.


This the same from the .gov email server and hotmail/outllook.com
Regards

Paul