email to hotmail blocked

Question

all emails from the domain lambro.co.uk to hotmail accounts are being blocked,i am asking this question on behalf of our customer lambert brothers and they are receiving bounce backs confirming they are blocked

the system administrator at Lamberts is Peter Goodchild and his email address is [e-mail]

hopefully you can unblock this domain name,many thanks Pete

my email is [e-mail] if you need any further information