djurhuus
My wish in this matter is that you can control users through LDAP (store all information usernames, password and rights etc.).
As previously advised you are best to submit this as a New Feature Request (NFR) to bugzilla, for consideration. Your NFR request won't get anywhere in these forums. Search bugzilla on LDAP as there are likely some requests along these lines already in the system.
If you have at user called ex. sales and 3 domains ex. domain1, domain2 and domain3 then you suddenly have a mailaccount in all 3 domains like sales@domain1, sales@domain2 and sales@domain3.
That is the way sme is, and is not likely to change as there is only one nameset.
Email addresses can be "controlled" to some degree by using Pseudonyms, (see the Pseudonyms section in the manual) where you create pseudonyms like
sales@domain1 > john
sales@domain2 > mary
sales@domain3 > fred
I'm not sure that will resolve your LDAP issues though, as john@domain1, john@domain2 and john@domain3 are still valid, but in theory of no consequence.
Again, raise this as a bug/NFR re integration/improvement of LDAP.