you do not have permissions (domain trust)

I have a two way domain trust setup between domain A, and domain B.  our exchange server sits in domain A, but users in Domain B need access to thier mailboxes on it.  I've given the users permissions on their mailboxes using thier domain B usernames via the trust, but when they try to send mail they get "You do not have permissions to send to this recipient" responses.   I have tried to give them Send on Behalf of permissions, but get an LDAP Provider error from Active Directory Exchange Extension.   Any help would be much appreciated.

breckdahlinAsked:
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sunnyc7Connect With a Mentor Commented:
Can you copy paste the error with the EventID's.

Also chck what errors do you get from event logs on exchange server.

on exchange server
start > run > eventvwr
Check if there are any msexchange errors under \application
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