"imtest" and virtual domains

[Gilles]

Hello.

I finally got to the point where I'm testing the IMAP server.

Trying

$ imtest -a 'gilles at harfang.homelinux.org' -s -p 993 -m plain mail
verify error:num=19:self signed certificate in certificate chain
TLS connection established: TLSv1 with cipher AES256-SHA (256/256 bits)
S: * OK mail.harfang.homelinux.org Cyrus IMAP4 v2.2.12-Debian-2.2.12-4 server ready
C: C01 CAPABILITY
S: * CAPABILITY IMAP4 IMAP4rev1 ACL QUOTA LITERAL+ MAILBOX-REFERRALS NAMESPACE UIDPLUS ID NO_ATOMIC_RENAME UNSELECT CHILDREN MULTIAPPEND BINARY SORT THREAD=ORDEREDSUBJECT THREAD=REFERENCES ANNOTATEMORE IDLE AUTH=GSSAPI AUTH=PLAIN SASL-IR
S: C01 OK Completed
Please enter your password:
C: A01 AUTHENTICATE PLAIN AGdpbGxlc0BoYXJmYW5nLmhvbWVsaX51eC5vcmcAazk0bmRyNGxkYXA=
S: A01 NO authentication failure
Authentication failed. generic failure
Security strength factor: 256

[Then Ctrl-D to logout (or "* BAD Invalid tag":  What does that mean?).]

And in the log file:

auth.info: Mar 26 12:01:16 saslauthd[5925]: do_auth         : auth failure: [user=gilles] [service=imap] [realm=harfang.homelinux.org] [mech=ldap] [reason=Unknown]
auth.debug: Mar 26 12:01:16 saslauthd[5925]: do_request      : response: NO
auth.notice: Mar 26 12:01:16 cyrus/imaps[23395]: Password verification failed

The user name has been split in two ("user" and "realm"), whereas the mailbox
was created with "cm user.gilles at harfang.homelinux.org" as indicated in the
doc for virtual domains.

All by itself authentication succeeds:

$ testsaslauthd -u 'gilles at harfang.homelinux.org' -p '<mypasswd>'
0: OK "Success."


What's the correct way to pass on "virtual" user names for authentication
(and, hopefully, access to the mailbox)?


Thanks,
Gilles