The only way to solve your puzzle is to examine the gory details of the specific message in question.

The documentation for the Reply-to list header keyword explains clearly that it will not work every time because some software products do not respect it. In most cases the List Owner does not have the power to force all list subscribers to use only the better software products.

If you get hold of all the header lines and can figure out which software was used to send the message, then you'll be closer to a solution - and you can take up the matter with the email client software developers.

It's also possible that the subscriber changed the TO: address by hand when composing the message.

On 6/28/2016 10:27 AM, F J Kelley wrote:

Hi,
I have just had a list owner ask how a mailing got distributed to her list when she has made an effort to prevent that.  The "Reply-To= " setting I used as a Subject is in force for this list, however, any of the subscribers may post to the list ("Send= Private").

I realize this may really come down to mail client software; my first assumption is that will be Outlook or OWA, though it might be something else.  And it is also possible this came from a mobile device, in which case, I cannot say what would have been used.

Thanks for any help,
--Joe

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