getting below error on exchange 2010 HUB and CAS server-
A message with the Internal Message ID 23009224 was rejected by the remote server. This message will be deferred and retried because it was marked for retry if rejected. Other messages may also have encountered this error.
and we already added below key-
<add key="RecipientThreadLimit" value="2" />
<add key="MaxMailboxDeliveryPerMdbConnections" value="3" />
but still getting the event ID- 8010, May I have any suggestion for this?