Were getting the following bounced emails when sending from Mimecast:
Message rejected: Please check your DKIM entry in your DNS for the domain you are sending from. Guide for bulk senders www.bt.com/bulksender
Their support (apart from it being terrible) just confirmed that its an issue the recipient side and that DKIM should be enabled in order for the email to be received.
We are sending from exchange direct to mimecast i believe.
Ideas where this can be done?