`FEATURE(ldap_routing)`

Enables LDAP-based routing of a particular address to either a different host or a different address.
LDAP lookup is first attempted on the full address (e.g., user@example.com) and then on the domain portion (e.g., @example.com)
Must declare a domain as LDAP routable using LDAPROUTE_DOMAIN()
- LDAPROUTE_DOMAIN(`example.com')
Three optional settings:
- mailHost LDAP map definition
```
Default: ldap -1 -v mailHost -k (&(objectClass=inetLocalMailRecipient)
				  (mailLocalAddress=%0))
```
- mailRoutingAddress LDAP map definition
```
Default: ldap -1 -v mailRoutingAddress -k (&(objectClass=inetLocalMailRecipient)
					    (mailLocalAddress=%0))
```
- Message disposition: bounce or passthru (default)
  - If there isn't a match, should the message be bounced or passed through and use the normal message routing
Note that neither of the default map definitions above includes the LDAP server hostname (-h server) or base DN (-b o=org,c=COUNTRY), both necessary for LDAP queries. It is presumed that your .mc file contains a setting for the confLDAP_DEFAULT_SPEC option with these settings. If this is not the case, the map definitions should be changed as described above.

The following possibilities exist as a result of an LDAP lookup on an address:

mailHost is	mailRoutingAddress is	Results in
set to a local host	set	mail delivered to mailRoutingAddress
set to a local host	not set	delivered to original address
set to a remote host	set	mailRoutingAddress relayed to mailHost
set to a remote host	not set	original address relayed to mailHost
not set	set	mail delivered to mailRoutingAddress
not set	not set	delivered to original address OR bounced as unknown user

The term local host above means the host specified is in class 'w' ($=w). Note that the last case depends on the third argument.

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