Thank you for replying.
Avast Business security.
Since my post last month I have changed the company that host (?) my emails but the server is still office exchange.
Still didn't work so tried disabling the firewall and sheilds on Avast and still didn't work.
I then tried using a gmail account, no help. Then hotmail but nothing works.
Moneysoft still think it's a problem with the server or Avast.
Any suggestions would be appreciated.