Hi,
Migrating from single 2010 server to 2x 2013 servers in prod and 1x 2013 in DR with a DAG cluster. I haven't begun migrating user mailboxes over yet. Mail is flowing through 365 to 2010 presently.
When running a health report on any 2013 server, I get an unhealthy FrontendTransport error. I suspect this is related to the following event log entries:
Application / MSExchangeTransport
EventID 1025
SMTP rejected a (P1) mail from 'HealthMailbox7730f2644a204d348de7f46d199b7df5@domain.local' with 'Client Proxy EX01' connector and the user authenticated as 'HealthMailbox7730f2644a204d348de7f46d199b7df5'. The Active Directory lookup for the sender address returned validation errors. Microsoft.Exchange.Data.ProviderError
Does anyone have an idea whats causing this?
David Robertson
