Ann,
... and cc'd the owner address. In that cc, the From line was, as I
explained, my email name = xxx . com @ groups.io.
So that explains it. Duane had it right.
The copy you received (via the +owner address) was sent to you by Groups.io. And in that case the DMARC rules apply, causing the From address modification in the message you received.
The pending member will receive your message with your original From address, as sent by your email service.
Shal
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