imapd Login failure from IMP

[Bernard Paris]

(message already posted one month ago but I got no solution)

Althought IPM, Horde and all the webmail features work all very well, 
I always get strange login failure messages in my imapd logs, coming 
from IMP accessing imapd:

Oct 15 14:48:52 guppy imapd[24717]: Login failure user=\200�)^H 
host=guppy [127.
0.0.1]
Oct 15 14:48:55 guppy imapd[24715]: Login failure user=P')^H 
host=guppy [127.0.0
.1]
Oct 15 14:48:55 guppy imapd[24717]: Login failure user=\200�)^H 
host=guppy [127.
0.0.1]
Oct 15 14:48:58 guppy imapd[24715]: Login failure user=P')^H 
host=guppy [127.0.0
.1]
Oct 15 14:48:58 guppy imapd[24717]: Login failure user=\200�)^H 
host=guppy [127.
0.0.1]
Oct 15 14:49:26 guppy imapd[24732]: Login failure user=@^Q+^H 
host=guppy [127.0.
0.1]

I'm afraid this will become worst when hundreed of users will access 
the IMP server.

here are things I use:
    redhat7.1 - kernel 2.4.9
    horde-1.2.6
    imp-2.2.6
    php404pl1
    mysql-server 3.23.32
    mysql  Ver 11.12 Distrib 3.23.32
    imap-2000c-10

Any help to understand and avoid this would be great.

====================================
Bernard Paris
Responsable Informatique Facultaire
Faculte de Psychologie et des Sciences de l'Education
Universite Catholique de Louvain
Louvain-la-Neuve
BELGIUM
--