It really isn't that hard, especially if you're going to pay someone a full-time salary to do it. I have self-hosted my whole email stack for like 20 years and nobody pays me shit. Granted it's aggravating, thankless, and relentlessly under attack. It can't be done with a typical home connection, and the process of properly configuring and securing it can mean dodging several large foot-guns (and some smaller, sneakier ones), but they're well-known and well-documented and there are even testers for almost all of them. I don't really recommend hosting your own mail server. It often feels like it's not really worth it (it probably isn't) but it's isn't hard per-se, particularly not for a corporation or institution, it's just rather obnoxious.
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