First a bit more background. We run our own mail server but there was nothing in the logs. The invoice site is protected first by basic Apache authentication (user and password) and secondly by a login with password to the invoicing site (along with other scripts that check the logs and adjust the firewall againat bad actors) The error reported stemmed from the webserver denying access to its own address in the absence of the server user/ password. Changing the apache server basic authentication to allow a curl request from itself. sufficed to allow the request to be actioned. It succeeded. Again many thanks for your prompt reply and hints.
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