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Re:Yahoo Triples Estimate of Breached Accounts to 3B by JoshTriplett on Tuesday October 03, 2017 @05:52PM (#15396537)
> I’ve run a fair amount of email campaigns where we strip out the + if gmail is the domain to ensure it doesn’t end up in some weird filter.

At which point you should wind up in the "how widely can I advertise that you're a spammer and all your outbound email should all be routed straight to /dev/null for sending mail to an email address you were never given" filter.

Re:Yahoo Triples Estimate of Breached Accounts to 3B by konschubert on Tuesday October 03, 2017 @09:27PM (#15397633)
I think that marking the mail as spam sends a signal to their email provider, putting a mark on their account?
Re:Yahoo Triples Estimate of Breached Accounts to 3B by jsjohnst on Wednesday October 04, 2017 @10:39AM (#15400740)
Depends on your isp and which email provider they use. The big marketing email services generally do have the feedback loop setup with Gmail though, so yes, you are right.