The mailing list for listmasters using Sympa

[<address@concealed>]

I recently moved from Sympa 5.4.7 to Sympa 6.2.13-1. on a new system.  The
ldap_alias_manager.pl script is now looking for an LDAP attribute maildrop
(maildrop: attribute type undefined). We have been using the qmail schema, but
it doesn't have this attribute.  Is there a recommended LDAP schema that has
all the attributes:
------------------------------------------------------------------------
dn:cn=terri-testlist,cn=denison.edu,ou=list,dc=denison,dc=edu

         maildrop: address@concealed
               cn: terri-testlist
         mailHost: listserv.cc.denison.edu
      objectClass: top
                   mailAlias
                   mailRecipient
mailTransportMode: sympa
mailAccountStatus: active
             mail: address@concealed
    mailtransport: sympa