Actually it looks like someone has added a POSTACK1 template form to
the list's MAILTPL file.  That subject is the default subject for that
template form.

On Wed, 25 Jul 2001 22:56:34 -0400 <[log in to unmask]> said:
>On Wed, 25 Jul 2001 15:57:21 EDT, Ruth Levine <[log in to unmask]>  said:
>> Just recently, whenever i post to any of our lists i receive a
>> message from Listserv with the following: Subject:      Reply sent to
>> anyone posting to the list (for "replybots")
>
>Look at *all* the headers (especially those Received: ones) and
>consider the possibility that the reply is coming from a subscriber
>to the list, not from Listserv itself.
>
>                                Valdis Kletnieks
>                                Operating Systems Analyst
>                                Virginia Tech