I'm getting a lot of these lately, that are not genuine.  Can I
influence the checking process in any way?

The enclosed  message, found in the  PLEASEHELP-L mailbox and shown
under the spool ID 0009  in the system log,  has been identified as  a
possible delivery error notice for the following reason: "Sender:",
"From:" or "Reply-To:" field pointing to the list has been found in mail
body.