Perhaps this is just a bug or something no implemented but . . .
I have Matrix working with our LDAP directory and matrix should send mails to 5000 employees.
Unfortunately it seems that Bulkmail is unable to work with LDAP groups even thought matrix is able to set permissions based on those groups.
I would see this as a bug in bulkmail that it is not corporating with LDAP but perhaps someone has a simple solution.
P.S. creating 5000 bulkmail accounts is not a good solution because the list changes daily.
Thanks
Adam