On 09/09/2015 05:26 PM, Nancy C wrote:
> 
> The subscriber has done nothing wrong & these messages are usually Hotmail,
> yahoo & aol accounts.


As Brian says, it sounds like DMARC. See the FAQ article at
<http://wiki.list.org/x/17891458>. Also, see
<http://wiki.list.org/DEV/DMARC> for background information.

-- 
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan
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