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AFAIK, there is no GMail list of known-good senders.

When they refer to a "Trusted Sender" they mean someone you have personally emailed two or more times: https://support.google.com/mail/answer/145919?hl=en&ctx=mail...

Actually a pretty clever compromise, IMHO.

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From the gmail bulk senders guidelines, "We also recommend publishing an SPF record and signing with DKIM. We do not authenticate DKIM using less than a 1024-bit key. By authenticating, inline images you send will be shown automatically. Recipients will not need to click the "Display images below" link."

https://support.google.com/mail/answer/81126?topic=12838

ok, so no opt-in... =)

Huh, interesting. I'm not sure that page is accurate. In my personal account I've never noticed that behavior -- even on messages I send which have a valid SPF + DKIM and a 1024 bit key.

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