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Pete,

What's the best way to prevent people from using another member's
email address to plant a faux post from the unsuspecting member?

I don't think there's anything the group management can do about that in terms of settings or other technological approaches. This may be something that you have to approach as a member management issue (grounds for moderation, removal, or banning) if and when it occurs.

In the case of messages posted to Groups.io I haven't tested it myself, but I would expect Groups.io to drop most forms of "spoofed" messages -- particularly those that come from spambots and other illegitimate sources. Less certain (in my mind) are those that come by way of a legit email service - as is probably the case in your test.

Major email services such as Yahoo Mail and Gmail don't allow users to spoof just any address - they require that you prove you are a legit user of that address. Usually they send a code to the address and you have to enter it. A malcontent won't be able to set up a spoof of an unsuspecting member using such a service.

I have used ISPs that don't bother with that test, and allow their users to spoof (nearly) any email address. Verizon, for example, used to allow me to spoof any address that wasn't another Verizon user. I'm not sure what, if anything, Groups.io would be willing to do technologically about malcontents who use a service like that.

If you have a specific example you might cite it to [email protected] and see what they have to say about it. There are tell-tales in the message headers that would allow them to recognize a spoof originating at a legit service. But Groups.io might be hesitant to reject all such spoofs, as there may be people using that technique legitimately.

Shal