SMTP domain '{1}' is set as an address space for SMTP connector '{4}' but a corresponding record cannot be retrieved from ...

SMTP domain '{1}' is set as an address space for SMTP connector '{4}' but a corresponding record cannot be retrieved from the metabase for SMTP instance '{3}' on server {2}. Please check whether this is a temporary metabase access issue or a record does not really exist. Error: {0}