501 Authentication cancelled

Hi,

I have the following problem. I have an exim3 running as a serverside
mailserver. For sending from my client machine I used exim3 too. That
worked fine. Now I use exim4 on my client side and since then have the
following lines in exims log when sending over my mailserver:

2004-10-03 11:43:34 Authentication failed for
dsl-082-082-202-076.arcor-ip.net (lurkabove.darkstar)
[82.82.202.76]: 501 Authentication cancelled
2004-10-03 11:43:34 1CE2ty-0006hb-00 <= marco@mherrn.de
H=dsl-082-082-202-076.arcor-ip.net (lurkabove.darkstar) [82.82.202.76]
P=esmtp X=TLSv1:RC4-SHA:128 S=525
id=E1CE2ty-0004x9-Jw@lurkabove.darkstar
2004-10-03 11:43:34 1CE2ty-0006hb-00 => spam <spam@mherrn.de> D=virtual
T=virtual_transport
2004-10-03 11:43:34 1CE2ty-0006hb-00 Completed

Obviously the message was accepted. But what means the authentication
failed? I have only login authentication enabled on my server.

Any ideas?

Greets,
Marco
--
Marco Herrn herrn@gmx.net
(GnuPG/PGP-signed and crypted mail preferred)
Key ID: 0x94620736