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Tom,

The person shown in the footer isn't subscribed either.

If you have examples of messages from your group containing an unsubscribe address in the footer that is not (and has not been*) subscribed to your group, I think that is definitely worthy of a #bug report in beta.


No other considerations are needed to know that that is a "can't happen" error - it doesn't matter how the message subsequently was delivered to the person that contacted you. An address in the footer that was not a member of the group at the time the message was sent "can not happen".

Unless some malcontent member is altering them to hide his/her identity. Or what Duane said about crooks copying message content and forging their own footer.

I'd want also to double-check the Received fields in the header as received by that person. Did the message come to her direct from Groups.io, or by way of some forwarding. If she's up to it, have her use this analysis tool and send you a screenshot or copy/paste of the results:


A message forwarded to you is not suitable for analysis - it will only lead back to the person who forwarded it. You need the header of the message as she received it. Some email interfaces (Thunderbird) have a "Forward as attachment" feature which will send you a file containing the original message, header and all. But the chances that she's using such an interface and knows how to use the feature seems slim.

*Double-check the "and has not been" by searching your group's Activity Log for the footer address.

Shal


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