Block specific domains to a specific recipient

What is the best way? I know we can do it through sieve, using something like:
envelope :domain :is
But, we would like to do this over LDAP or even a file which we can modify. Is this possible with mappings file? (but remember, this is only for specific user).

You could use a SEND_ACCESS or ORIG_SEND_ACCESS mapping table entry
http://wikis.sun.com/display/CommSuite/Mail+Filtering+and+Access+Control#MailFilteringandAccessControl-SendAccessandMailAccessMappingTables
to match mail from this specific user and a disallow certain destination address or only allow certain destinations or make the destination part of the pattern be another mapping table lookup to see which destinations should be allowed or denied.
But this is all based on the sender being honest about his identity when sending a message. ie, is the source address info trustworthy?
You could require SMTP authentication in certain scenarios.

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