>It is best used that way, especially if per-user lookups involve LDAP, MySQL >or similar. A more complex, but more performant solution is to rewrite each >type of user to a suitable domain that is routed to the >r>ght place. Then, if >absolutely necessary use smtp_generic_maps to rewrite back to the original >address during SMTP delivery, but better to have each destination accept >non-public internal "route" >addresses.
I ended up just collating the email addresses from each receiving server, and do an auto-updating transport with a line for each user. Not pretty, but works ;)
