'Mailbox unknown' unpon LMTP delivery

[Henning Holtschneider]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,

I've just started using Cyrus IMAP (as part of the KDE Kolab server project) 
so please forgive me if this question is stupid and I should have looked 
elsewhere before.

I'm running Cyrus IMAP 2.1.13 on top of Postfix. Mail is being delivered from 
Postfix into Cyrus using an LMTP unix socket. My users have email addresses 
like firstname.lastname at domain.tld. The login names/mailbox names are unique 
user ids like "jdoe123". I created a virtual transport map in Postfix to map 
"firstname.lastname at domain.tld" to "username at domain.tld". Howerver, incoming 
messages can't be delivered to the mailboxes. Cyrus complains:

Jun 20 19:19:07 mail <info> postfix/lmtp[14044]: 3607DB3A73:  
to=<username at domain.tld>, orig_to=<firstname.lastname at domain.tld>, 
relay=/kolab/var/kolab/lmtp[/kolab/var/kolab/lmtp], delay=13, status=bounced 
(host /kolab/var/kolab/lmtp[/kolab/var/kolab/lmtp] said: 550-Mailbox unknown. 
Either there is no mailbox associated with this 550-name or you do not have 
authorization to see it. 550 5.1.1 User unknown (in reply to RCPT TO command))

I'm getting no suspicious messages in the LMTP log file. I tried to increase 
verbosity by setting CYRUS_VERBOSE=1 but this only results in more master 
messages and no additional LMTP log messages :-/ Is it possible to increase 
the LMTP logging level?

What's wrong with my setup? From reading the docs and the mailing list 
archive, I understand that Cyrus will take the recpipient address, strip off 
the domain name part and use the username to find a maildrop with the same 
name. This does not seem to be the case on my machine or I did not understand 
Cyrus correctly? 

Thanks for your help,

     <-gninneH<-
- --
   __                 _  __    __   Henning Holtschneider
  / /  ___  _______ _/ |/ /__ / /_  <henning at loca.net>
 / /__/ _ \/ __/ _ `/    / -_) __/
/____/\___/\__/\_,_/_/|_/\__/\__/  ...net happens!
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.1 (GNU/Linux)

iD8DBQE+9vUtP9goCV2uudcRAkF/AJ9cRU9FIEUac6sWGp/8IpbhnDKecwCfeCIV
f5iuP2bhMr6Q2GGG6Ie9Mls=
=WtG2
-----END PGP SIGNATURE-----