Did you peek to see if anything correlates with their postmaster pages at https://support.apple.com/en-us/HT204137?
That's normally where I start to dig & research. Thanks, Udeme On Thursday, March 24, 2016, Joel Beckham <j...@bombbomb.com> wrote: > Does anyone have any advice for troubleshooting what we're doing to upset > icloud domains so that they're dropping our mail? All our normal signals > (feedbackloops, bounces, etc) we use to suspend and terminate users sending > unwanted mail aren't showing anything unusual as well as all the reputation > signals we use are all showing that we're good. > > We are getting some intermittent bounces pointing to a Proofpoint block > (which seems to be coming and going), but the majority of the mail is being > accepted and then appears to be getting discarded (based upon open rates > and our own testing). > > Thanks! > > -- > JOEL BECKHAM > > [image: BombBomb | Face to Face with more people, more often] > W: BombBomb.com > <https://bb.bixel.io/v1/track/click/5b03ad2e-fba5-0317-3bbe-4f961d5f5cc0/gm%3A1458844542276/mailop%40mailop.org/?http%3A%2F%2Fwww.bombbomb.com=> > [image: BombBomb | Face to Face with more people, more often] > -- Thanks, Udeme Sent from my iDevice; kindly excuse any typos.
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