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O365 email local cache (programming.dev)

submitted 9 months ago* (last edited 9 months ago) by [email protected] to c/[email protected]

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Work uses O365 and I'm getting a little frustrated with OWA. Thinking about running a local email server to mirror O365. In the end, I want to keep my email in O365, but have a 2 way sync with a local imap server. Looks like I have a few options on the email server - dovecot/cyrus/stalwart. For the syncing, I just see mbsync. Any experience setting up something similar? Any other options other than what I listed?

Edit: IT knows what I'm doing. I'm not going to compromise any compliance requirements we have.

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[–] [email protected] 3 points 9 months ago

M365 is doing away with all legacy authentication, do not be surprised if IMAP is completely unusable in the next 12 months. If you simply want to keep a copy of everything, a store and forward SMTP proxy would probably be the solution, so all email going to your domain would hit that first, then send off to M365.