UserA made a post to her list, it was distributed.

UserB responded; it went to the list as well, in spite of the
  Reply-To= Sender,Ignore

As a subscriber, UserB *could* post to the list ("Send= Private"), it is the reply she (and I) see as a concern.

As mentioned, this may really be an issue of the mail client software, and as yet I do not know what was used for the reply.  


________________________________________
From: LISTSERV List Owners' Forum <[log in to unmask]> on behalf of Pete Weiss <[log in to unmask]>
Sent: Tuesday, June 28, 2016 10:52 AM
To: [log in to unmask]
Subject: Re: Force "Reply-to= Sender,Ignore"??

Though the details of what you are asking are not well definied,

Pete

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