exchange 2013 external client send in smtp
thunderbird can send email
Windows live mail gives these error
Server Response: 550 5.7.1 Client does not have permissions to send as this sender
on exchange smtp log i found
2014-07-15T13:52:18.456Z,CAS\Client Frontend CAS,08D1448A8AB29CBF,39,*.*.*.*:587,*.*.*.*:35136,*,mydomain/postmaster33,authenticated 2014-07-15T13:52:18.565Z,CAS\Client Frontend CAS,08D1448A8AB29CBF,40,*.*.*.*:587,*.*.*.*:35136,*,,Proxy session was successfully set up. Session mydomain/postmaster33 will now be proxied 2014-07-15T13:52:18.565Z,CAS\Client Frontend CAS,08D1448A8AB29CBF,41,*.*.*.*:587,*.*.*.*:35136,>,235 2.7.0 Authentication successful, 2014-07-15T13:52:18.931Z,CAS\Client Frontend CAS,08D1448A8AB29CBF,42,*.*.*.*:587*.*.*.*:335136,-,,Remote(SocketError)
any idea?