We are migrating emails via a pst file from an outside email system (which they were using pop) to now get their email via exch 2010. Whenever the users tries to send an email to a certain address, which this adddress is setup in exch as an accepted domain, they are getting the following error:
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk
Am I missing something on the exch server setup?.
I can send to the same email address from my own email and it works just fine but does not from the clients email.
Any ideas here would be apprecitated.