I installed CU7 and have an issue when OWA tries to send email to same mailbox/CAS server it resides on. I'm in a mixed 2007/2010/2013 environment with several edge & multiple CAS/mailbox servers and this is affecting all 2013 servers at CU7 while all 2013 CU6 are working fine. Every CAS/Mailbox server runs OWA as these are located at different geographic locations.
OWA can send email to the outside world and to other CAS/mailbox servers fine but just not to itself. Outlook clients are routing fine when on the same server or other servers.
The last message tracking I Get is 250 2.1.5 Recipient OK with Event Data of E2Elatency, 2.016 Microsoft.Exchange.Transport.Mailrecipient.RquiredTLSAuthLevel Opportunistic. Delivery Priority Normal
And then it no longer appears in any log or queue.
Any suggestions on where to look would be appreciated.