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Getting rid of the via at Gmail

There was a question submitted today about the verification process at Gmail.

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Hotmail moves to SPF authentication

Hotmail has recently stopped using Sender ID for email authentication and switched to authenticating with SPF. The protocol differences between SenderID and SPF were subtle and most senders who were getting a pass at Hotmail were already publishing SPF records.
From an email in my inbox from September:

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DMARC Interoperability

Facebook hosted a DMARC interoperability event earlier this week. In terms of protocol development, interoperability events are a sign that the protocol is ready for more widespread use.

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