How do I store sendmail aliases in LDAP?

Issue

• How to convert the aliases db to an LDAP format and have it work with Sendmail? Please see the following example:

• Used the following option in sendmail mc file.

define('ALIAS_FILE', `ldap:`)

• It created the following sendmail.cf setting

O AliasFile=ldap

• And here is an example entry loaded into ldap server.

# ldapsearch -v -x -b 'dc=example,dc=com' '(objectclass=nisMailAlias)' 

# rocker, Aliases, example.com 
dn: cn=rocker,ou=Aliases,dc=example,dc=com
cn: rocker
objectClass: nisMailAlias
objectClass: top
rfc822MailMember: rocke.robertson@example.com