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How do I set up mail in a box on a sub domain? Example.com is on outlook which I cannot disrupt but I’d like to set up and programmatically access all the emails coming to anything at dev.example.com

Preferably just query what emails do I have coming in for local name at dev dot example dot com

Deliverability is not a problem because I don’t intend to send any mail. Just need a sinkhole I can query. How difficult is this?

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I haven't done it but I see no reason why it would be hard. You just tell it the domain to use which should be able to include the subdomain. One thing is that usually you point the domain's nameserver at the mailinabox server and it sets up all the right records for you. If you can do that on a subdomain then it's super easy. If not you just have to manually set all the records. Mailinabox shows you everything to set if you do it this way though.

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