Wed, 16 May 2018 06:00:24 This message is a "probe" for your subscription to the FMPRO-L list. You do not need to take any action to remain subscribed to the list. In particular, you should not reply to this message. Simply discard it now, or read on if you would like to know more about how this probing mechanism works.
A "probe" is a message like the one you are reading, sent to an individual subscriber and tagged with a special signature to uniquely identify this particular subscriber (you may not see the signature because it is in the mail headers). If the subscriber's email address is no longer valid, then the message will be returned to LISTSERV and the faulty address will be removed from the list. If the subscriber's address is still valid, then the message will not bounce and the user will not be deleted.