Recently I noticed Yahoo Groups changed their header From field to align it properly per DMARC. For example, a message from the Slide Rules discussion group (posted by a fictitious user) might contain:

To: [email protected]
From: "Joe Blow [email protected] [sliderule]" <[email protected]>
Sender: [email protected]
Reply-To: [email protected]

So by default a reply goes to the list only. For a private reply you must manually copy and paste the user's address.

The header also contains DKIM and DomainKey signatures.
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