Hello!
I have Win2012 and Exchange 2013 in all servers. The situation is following:
1) installed MAILCAS.example.com with MBX and CAS roles. Created AUTODISCOVER.example.com (cname to MAILCAS) in public DNS servers.
2) installed MAIL.example.com with CAS role.
3) installed MBX1 and MBX2 with MBX role and created DAG.
4) moved mailboxes from MAILCAS to DAG.
5) changed AUTODISCOVER.example.com and MX record to point to MAIL.example.com
5) Now I want to remove server MAILCAS. Problem is in sending e-mails to internet. When MAILCAS is shut down, then e-mails to internet recipients accumulate to queue. After turning MAILCAS on, the e-mails fortunatelly go out.
When I compare the send connector settings in ECP then they are the same for MAIL and MAILCAS.
"Proxy through client access server" is not selected.