Problem with nnimap on a Lotus Domino server

[Adrian Lanz]

I wanted to give the nnimap backend a try on our company server (Lotus
Domino). [Pressing 'B' in the group buffer and following the
instructions.]. However, no success: after connecting to the server (I
think: the backend is listed in the server buffer), I see no new group
in the group buffer and a message in mode-line and the *Message* buffer
simply says: "Couldn't request list: ". Any clue? Below, what I find in
the debug and log buffers, and what a telnet session to the server says.

Many thanks, Adrian.

PS: Below, I replaced the Control-M in the log buffers with the two
characters "^" and "M" (and, of course, changed, usernames passwords,
server names, domains).

PPS: Fetching mail messages form the same server works perfect:
(mail-sources '((imap ...))).


*Messages*

Connecting to domino.imap.server.com...
Opening nnimap server on domino.imap.server.com...
Opening connection to domino.imap.server.com...
Do you want to save this password in ~/.authinfo.gpg? (y or n)  n
Opening nnimap server on domino.imap.server.com...done
Reading active file...done
Couldn't request list: 

*imap log*

14:04:39 1 CAPABILITY^M
14:04:45 2 LOGIN "username" "password"^M
14:04:45 3 LIST "" "*"^M
14:04:50 4 LIST "" "*"^M
14:04:51 5 LIST "" "*"^M

*nnimap domino.imap.server.com nil  *nntpd**

* LIST (\Noinferiors \HasNoChildren) "\\" Inbox^M
* LIST (\Noinferiors \HasNoChildren) "\\" Trash^M
* LIST (\Noselect \HasChildren) "\\" "Other Users"^M
* LIST (\Noselect \HasChildren) "\\" {36}^M
Other Users\Charly Stoner/COMPANY^M
* LIST (\Noselect \HasChildren) "\\" {28}^M
Other Users\Patrick Thumb/COMPANY^M
* LIST (\Noselect \HasChildren) "\\" {33}^M
Other Users\Estelle Th&APw-ffer/COMPANY^M
* LIST (\Noselect \HasChildren) "\\" {30}^M
Other Users\Sandrine Bold/COMPANY^M
5 OK LIST completed^M

*telnet session*

telnet domino.imap.server.com imap
Trying 10.10.10.10...
Connected to domino.imap.server.com.
Escape character is '^]'.
* OK Domino IMAP4 Server Release 8.5.1FP2 ready Mon, 22 Nov 2010 14:10:33 +0100
a001 login username password
a001 OK LOGIN completed
a002 capability
* CAPABILITY IMAP4rev1 AUTH=PLAIN LITERAL+ NAMESPACE QUOTA UIDPLUS
a002 OK CAPABILITY completed
a003 logout
* BYE logging out
a003 OK LOGOUT completed
Connection closed by foreign host.