Ah, good, someone else is getting them, too...  All of ours have a from:
line IN%"[log in to unmask]"  "ListEARN List Processor", but the message
is exactly the same:
 
>Subj:  Output of job "ARCANA" from LISTBIT@VTBIT
>
>Command replies from LISTBIT@VTBIT are being forwarded to you.
>
>You are not allowed to use inter-server DISTRIBUTE control keywords. Your
>DISTRIBUTE job has been transferred to the postmaster.
>File has been transferred to postmaster.
 
Very interesting, of course, but we'd rather not get them at all.
 
Mario Rups, co-listowner, ARCANA
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