There is a known email forwarding issue that the Webministry is working diligently on to resolve.
Due to the migration of the EK Server some degradation of service will be experienced intermittently. Please try sending your email again after a bounce message.
If you continue to receive bounce messages, please open up a Helpdesk ticket with the example email.
PLEASE supply as much header details as possible so that we may be able to find the source of the issue and determine a resolution if it is due to the migration.