It works this way.  

sen...@yahoo.com posts to the list.  The mailing list package forwards the post 
to all the subscribers. Everyone on the list EXCEPT the subscribers using 
yahoo.com will see the post.  yahoo.com will reject the message as a forgery, 
so no one using yahoo.com will see the message.  It's not clear to me if 
u...@yahoo.com will be unsubscribed because of the bounces or just 
sen...@yahoo.com.  It seems likely that a malicious person could unsubscribe 
all yahoo users from a list by creating a yahoo account and posting to the list 
a bunch of times.

In all cases, the mailing list gets the post.  It's what happens next that 
poses the problem.

Reg

--------------------------------------------
On Thu, 5/15/14, Discussion list for OpenIndiana 
<openindiana-discuss@openindiana.org> wrote:

 Subject: Re: [OpenIndiana-discuss] "Discussion list for OpenIndiana"
 To: openindiana-discuss@openindiana.org
 Date: Thursday, May 15, 2014, 1:56 PM
 
 Sorry, but you misread: I
 am asking about other *mailing lists*.
 
 They, the *mailing lists*, are receiving email
 from @Yahoo users.
 
 How?
 
 On 15/05/2014 19:17, Discussion list for
 OpenIndiana wrote:
 > u...@yahoo.com
 doesn't get any posts from other yahoo users.  After
 a
 > certain number of bounced emails, 
 sen...@yahoo.com
 gets
 > automatically removed from the
 mailing list.
 
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