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| | The following policy is now implemented:
    * users can use their SASL login name as sender address;
    * alias and/or list owners can use the address as envelope sender;
    * domain postmasters can use arbitrary sender addresses under their
      domains;
    * domain owners can use arbitrary sender addresses under their domains,
      unless it is also an existing account name;
    * for known domains without owner or postmasters, other sender addresses
      are not allowed; and
    * arbitrary sender addresses under unknown domains are allowed. | 
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| | Postfix interprets Error Code 32 (No Such Object) as lookup failures,
but that's ugly...
Also, make Postfix simple bind against
cn=postfix,ou=services,dc=fripost,dc=org. | 
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| | The clients are identified using their certificate, and connect securely
to the SyncProv.
There are a few workarounds (XXX) in the ACLs due to Postfix not
supporting SASL binds in Wheezy.
Overview:
  - Authentication (XXX: strong authentication) is required prior to any DIT
    operation (see 'olcRequires').
  - We force a Security Strength Factor of 128 or above for all operations (see
    'olcSecurity'), meaning one must use either a local connection (eg,
    ldapi://, possible since we set the 'olcLocalSSF' to 128), or TLS with at
    least 128 bits of security.
  - XXX: Services may not simple bind other than locally on a ldapi:// socket.
    If no remote access is needed, they should use SASL/EXTERNAL on a ldapi://
    socket whenever possible (if the service itself supports SASL binds).
    If remote access is needed, they should use SASL/EXTERNAL on a ldaps://
    socket, and their identity should be derived from the CN of the client
    certificate only (hence services may not simple bind).
  - Admins have restrictions similar to that of the services.
  - User access is only restricted by our global 'olcSecurity' attribute. | 
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|  | This is because the UNIX domain socket to connect to when performing
LDAP lookups needs to be in the chroot.
Also, don't open a INET socket unless we're a Sync Provider. |