Odd errors in /var/log/messages

Fran Boon flavour@partyvibe.com
Wed, 3 Jan 2001 14:21:36 -0000 

 Jan  3 14:08:45 localhost IMP[1260]: Login 10.10.80.8 to localhost:143 as
flavour
 Jan  3 14:08:46 localhost imapd[13288]: Login failure user=шь^Z^H
host=localhost.localdomain [127.0.0.1]
 Jan  3 14:08:49 localhost imapd[13288]: Login failure user=шь^Z^H
host=localhost.localdomain [127.0.0.1]
 Jan  3 14:08:52 localhost imapd[13288]: Login failure user=шь^Z^H
host=localhost.localdomain [127.0.0.1]
 Jan  3 14:09:08 localhost imapd[13308]: Login failure user= ^]$^H
host=localhost.localdomain [127.0.0.1]

All seems to be working fine, though...

Any ideas? Nice to have less rubbish in the logs, of course :)

Best Wishes,
Fran.