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We would love to be able to send push notification to native apple Mail app for our users but we never wrapped our head around the whole certificate thing. (And Apple was... unhelpful).

Would love to have support on this! Are you available? Let me know (nicolo.benigni@qboxmail.com)

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I think the best explanation (including APNS which is on top of IMAP open connections) on the certificates and key usages is described here: https://micromdm.io/blog/certificates/

ABE and ABM both use the same technology so it's pretty much exactly how Apple intends it to be used. There used to be someone hosting a shared CA for this, but it because cumbersome to deal with third parties not loading the CRL and not using OSCP.

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