[Dovecot] auth failed, 0 attempts

[Bruce Bodger]

Does anyone have any ideas what this may be?

Aug 25 12:19:01 G520X2 dovecot: imap-login: Disconnected (auth  
failed, 0 attempts): rip=192.168.1.1, lip=192.168.1.10
Aug 25 12:19:01 G520X2 dovecot: imap-login: Disconnected (auth  
failed, 0 attempts): rip=192.168.1.1, lip=192.168.1.10

Hits the server every minute.

Running v 1.1.2 on OS X
192.168.1.1 is the router
192.168.1.10 is the server on which dovecot is running.

Just started noticing it.

Thanks,
B. Bodger