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A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

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O365 email local cache (self.selfhosted)

submitted 9 months ago* (last edited 9 months ago) by tastysnacks 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] 10 points 9 months ago (1 children)

If I was in your IT department I'd be required to shut this down and probably revoke your access until our bosses decide on your future.

Keep in mind, your employer has a responsibility to protect their data and this would subject your homelab to any legal liabilities such as a lawsuit search order and data privacy auditing.

Any solution you work out needs to be signed off on in writing if it's outside their expected usage.

Another important point o365 requires oauth2 authentication unless your IT department has intentionally allowed other forms of authentication or they are in a hybrid legacy environment.

When they broke EWS and office 2010 compatibility they crippled many foss solutions without an additional license and the tools that do work will report details to exchange about your homelab. So if your department is diligent it'll come to their attention.

[–] tastysnacks -1 points 9 months ago

Oauth2 is being used as well as 2FA. We're not breaking any of that. My local email server will be running on company equipment. I already have ITs approval on this.