Ilene,
Another thing I did notice was *Via Groups IO* gets attached to their
name in the From Field
You use gmail and it shows in the from field just your name.
That's Groups.io's work-around for "the DMARC problem" at work.
If IncrediMail has a way to show you the full from address (including the email address, not just the display name) you'll find that those members' messages are
From: displayname <username@...>
It is the fact that the actual From address ends with @groups.io rather than the member's actual domain (yahoo.com) that causes the phrase "Via groups.io" to be displayed by Incredimail (and many other services).
Why this address munging is necessary for some email services is a bit of a long sad story. Search GMF for "DMARC" and you'll likely find more than you wanted to know.
Shal
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