Thanks for your reply Falko.
alan@smail:~$ sudo updatedb
alan@smail:~$ sudo locate clamd.conf
I have noticed that in clamd.conf there is this line:
but that folder only contains one file
It is causing the mail server to run very slowly. I sent a mailout yesterday at midday to 54,326 recipients and this morning at 10:00am there is still 53,000 messages in the queue.
Thanks for your help with this.