I discussed this briefly with our Abuse Prevention team, but I’d love it if I could get some more info. Is Mailchimp signup email included in the spike you are seeing? If so would you mind sending me some examples so that I can share those with the Abuse Prevention team to make sure nothing is slipping through the cracks on our end?
Thanks, Matt Gilbert -- Deliverability Engineer | Mailchimp delivery.mailchimp.com > On Nov 25, 2019, at 1:07 PM, rps462 via mailop <[email protected]> wrote: > > We've seen a big spike in list bombing in the last few weeks. Individual > mailboxes receiving 10k+ "confirm your subscription" emails, all from > legitimate ESPs. So we heavily rate limited them thinking/hoping that ESPs > would see their queues build up, prompting them to look and see what wasn't > getting delivered, perhaps even detect the abuse and stop it!! (I know, I'm > dreaming.) > > List bombing isn't anything new. I figured most would have had something in > place to detect this by now. Perhaps a new technique is being used by the > abuser? These attacks are spread across hundreds of ESPs, but each individual > one is sending anywhere from 30 to 150 unique confirmation messages per hour > .. to the SAME rcpt. That should be pretty detectable. > > Anyway, if you're an ESP and you find yourself being heavily rate limited by > one or more US/CA/EU ISPs then you might want to check for some list bombing > abuse. > > Thanks, > -R. Smith > _______________________________________________ > mailop mailing list > [email protected] > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
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