Spamassassin and fetchmail without delays for local clients

Most of my mail is delivered by smtp directly to me, but my secondary max records cause some mail to be delivered to a POP3 mailbox- this is then retrieved using spamassasin.

This works very well generally - I get my mail very quickly and implement spam/virus filtering. The only problem is that many spammers deliberately target secondary mail servers as being less likely to have spam filtering, so I still filter mail received vi fetchmail even though this is seen by my mail server as local mail.

In order to allow my mail client to deliver to the server without waiting for the spam scan I have configured the server to listen on two local ip addresses (127.0.0.1 and 127.0.0.17) fetchmail delivers to the first which is filtered - my mail client delivers to the second - and mail to this address is accepted without spam scanning