hi all ,
recently we have added new Exchange Server Node ( one CAS/HUB and one Mail box ) to our environment exchange 2013 .
we trying to send email to outside some emails are going and other are failed to deliver with below NDR :
Remote Server at [172.20.1.24] (172.20.1.24) returned '400 4.4.7 Message delayed' 1/10/2016 2:37:42 PM - Remote Server at [172.20.1.24] (172.20.1.24) returned '441 4.4.1 Error encountered while communicating with primary target IP address: "Failed to connect. Winsock error code: 10060, Win32 error code: 10060." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was 172.20.1.24:25'
when shutdown the new add mailbox server all are working fine any idea ?