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David,

Both claim not to have unsubscribed, and there is nothing in the
Activity log to show them unsubscribing.

There shouldn't be a circumstance where a member leaves or is removed from a group or subgroup without that action being logged in the group or subgroup. So that's something I'd report to [email protected]

But check carefully before doing so. Notably, the activity log search does not do partial matches (whereas Members list search does). Enter the former members' email addresses in full to be sure you find all activity log records for them.

I think there was a report not to long ago of an unlogged exit from a group, but IIRC that involved the member deleting their groups.io account - which wouldn't explain someone leaving the subgroup but not the primary group.

The one who disappeared from the subgroup sent a message as a test,
and it was delivered to the subgroup, but with a from address of
fred=mac.com @ xxxx.groups.io. In what circumstances is the address
rewritten like this? It may be a clue.

As Duane mentioned, that form of address modification is done with certain email services (you'll see it for yahoo.com and aol.com addresses too). It doesn't signify anything.

But... Did he/she send that test after being returned to the subgroup? Or does the subgroup allow non-subscriber posting (was the message held pending before posting)? Or... ???

Shal


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