SBS 2011 with Exch 2010, not fully migrated yet, so the SBS 2008 with Exch 2007 is also on the net. However, all email is being sent and received by the New Server.
On a few domains, I am getting this error (when sending looking in the Outbound Queue):
4220.127.116.11 Primary target Ip address responded with "418.104.22.168 Connection dropped due to SocketError "Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. "
On many domains, no problems at all. Any ideas?