Question on LDAP Schema(s) for Intranet Mail Routing

[Nick Milas <nick@eurobjects.com>]

Hello,

In file misc.schema, included in the standard OpenLDAP distribution, we 
read about the Lachman/Laser mail routing schema (which defines 
inetLocalMailRecipient objectClass with mailLocalAddress, mailHost, 
mailRoutingAddress attributes, drafted e.g. here: 
http://www.sendmail.org/m4/laser.txt):

   # Not recommended for production use!
   # Use with extreme caution!
   #-----------------------------------------------------------
   # draft-lachman-laser-ldap-mail-routing-02.txt !!!EXPIRED!!!
   #       (a work in progress)

and:

   # ...Contents of this file are
   # subject to change (including deletion) without notice.

Question 1: Should this schema be considered now, after all these years, 
as being stable and a solid basis for implementation? If so, perhaps in 
next releases these comments could/should be removed?

Question 2: As far as I can tell, qmail-ldap schema is also used around 
for the same purpose. It seems this can be found in different versions, 
as the initial one had problems (ref.: 
http://www.openldap.org/lists/openldap-software/200304/msg00378.html). 
This schema is a considerably extended version of the Lachman/laser one. 
So:
2.a: Is there some kind of draft elaborating on this schema?
2.b: Is there some official and working (with no issues) version of the 
schema?
2.c: If 2.b is No, where can we find even an unofficial, yet 
corrected/working version of the schema? I've only found a reference 
here: 
http://www.openldap.org/lists/openldap-software/200304/msg00418.html but 
no the schema itself. Also, I don't know if we can trust the one here: 
http://www.zytrax.com/books/ldap/ape/qmail.html (which interestingly 
mentions that "This schema is released with a standard OpenLDAP 
distribution" but I haven't seen it in the schema directory of OpenLDAP 
distros).

Thanks,
Nick