Cyrus IMAP is configured with "servername cyrus.rrz.uni-koeln.de", the machine has multiple IP addresses and I thought there might be realm problems, but trying to authenticate using [EMAIL PROTECTED] doesn't work either.
Got it, to some degree. Adding this line to /var/imsp/options:
imsp.login.realms N (cyrus.rrz.uni-koeln.de)
allows users to login using [EMAIL PROTECTED] The documentation says it's only for Kerberos, but it works for DIGEST-MD5 as well. Hacking sasl_support.c to call sasl_server_new with cyrus.rrz.uni-koeln.de as user realm makes it possible to use bare user names as well.
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Sebastian Hagedorn M.A. - RZKR-R1 (Gebäude 52), Zimmer 18
Zentrum für angewandte Informatik - Universitätsweiter Service RRZK
Universität zu Köln / Cologne University - Tel. +49-221-478-5587