Our organization uses exchange 2010 mail server. Our mail server work well but can't send mail to one domain. Other domains are no problem. Domain is ccb.com. Mail entered queue and occurred following error:
4188.8.131.52 Primary target IP address responded with: "421 internal can't stack B channel SSL filter ."Attempted failover to alternate host, but that did not succeed.
Either there are no alternate hosts, or delivery failed to all alternate hosts.
Our organization uses "Watchguard" firewall and is it depend that problem?