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I'm configuring a IMAP server with Exim/Dovecot on a Debian machine serving multiple domains with distinct users. To active this I configured a router and a transport:

dovecot_router:
  driver = accept
  require_files = +/home/imap/${domain}/${local_part}/
  transport = dovecot_transport
dovecot_transport:
  driver = appendfile
  user = imap
  group = imap
  mode = 0600
  directory=/home/imap/${lc:$domain}/${lc:$local_part}/
  maildir_format = true
  mode_fail_narrower = false
  envelope_to_add = true
  return_path_add = true

This works well, if the path /home/imap/domain1/user1 exists, the maildir structure is created with the file-owner (and existing user) imap.

But: The complete path to /home/imap/domain1/user1 must be be readable for all system users (o+rx). If I remove this, I can test it

exim -bt user1@domain1
R: system_aliases for user1@domain1
user1@domain1
   router = dovecot_router, transport = dovecot_transport

but while receiving mails via SMTP they get rejected: 2011-09-12 17:16:22 H=(test.local) [192.168.165.251] F=<me@domain2> rejected RCPT <user1@domain1>: Unrouteable address

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