SMTP connector '{4}' is configured to forward messages addressed to domain '{1}' to smart host '{0}' but the '{5}' property ...

SMTP connector '{4}' is configured to forward messages addressed to domain '{1}' to smart host '{0}' but the '{5}' property in the metabase for SMTP instance '{3}' on server {2} cannot be found. This SMTP connector may not be able to route messages correctly.