We have recently migrated to server 08 and exchange 2010 from sbs 2003. We are able to send internally, but not externally. We have created an internet send connector, with smart host (tried with direct dns also). The error we receive is :
Delivery has failed to these recipients or groups:
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
The following organization rejected your message: exchange.ourdomain.local.
Diagnostic information for administrators:
Generating server: exchange.ourdomain.local
exchange.ourdomain.local#530 5.7.1 Client was not authenticated ##
Can EE please help. We have been hitting it hard to try and resolve (EE that is, not the bottle)..