On Wed, 19 Apr 2017 10:40:41 -0400, William Schults
<[log in to unmask]> wrote:

>              Last error: 5.7.105 554 5.7.105 SenderFilterAgent; Sender
>                            denied as sender's email address is on
>                            SenderFilterConfig list

Not a LISTSERV error, but comes from Outlook/Exchange.  See 
https://social.technet.microsoft.com/Forums/Lync/en-US/aac98820-d3a4-4655-9c38-3dee43a9178f/sender-denied-as-senders-email-address-is-on-senderfilterconfig-list?forum=Exch2016MFSM

As I understand this, if some Outlook user marks a particular Sender as
'blocked', in recent versions of Exchange, this info gets 'pushed' from that
user's Outlook to the central Exchange server, so it may block that sender
for everybody.  

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