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Re:How does the Gmail unsubscribe button work? by inetknght on Friday May 29, 2020 @12:50PM (#23352342)
> if they use a reputable bulk mailing service

If they use a reputable bulk mailing service instead of using their first-party domain then they are indistinguishable from a phishing attack.

Re:How does the Gmail unsubscribe button work? by BGZq7 on Friday May 29, 2020 @03:34PM (#23354520)
> If they use a reputable bulk mailing service instead of using their first-party domain then they are indistinguishable from a phishing attack.

With most bulk mailing services, the message will come from the "first-party domain". They will have configured that service as a legitimate sender for the domain via SPF/DKIM DNS records.

Re:How does the Gmail unsubscribe button work? by inetknght on Friday May 29, 2020 @04:12PM (#23354926)
> With most bulk mailing services, the message will come from the "first-party domain". They will have configured that service as a legitimate sender for the domain via SPF/DKIM DNS records.

It's not just the from:[email protected] that I'm talking about. If the unsubscribe link does not also go to firstparty.com, then it's still indistinguishable from phishing.

Re:How does the Gmail unsubscribe button work? by judge2020 on Friday May 29, 2020 @04:08PM (#23354892)
No, a reputable bulk mailing service can still send from their customers' principal domains with spf/dkim set up to include that service's info.
Re:How does the Gmail unsubscribe button work? by inetknght on Friday May 29, 2020 @04:11PM (#23354912)
> No, a reputable bulk mailing service can still send from their customers' principal domains with spf/dkim set up to include that service's info.

Tell that to the links in the email that go to the reputable service's click aggregation service.