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Re:Show HN: OpenBSD Email Service – A free-email alternative by drewpc on Friday February 16, 2018 @01:48PM (#16394742)
Seriously? I'd recommend doing some more research before making that claim. Your example in a later comment speaks to the area of Privilege Separation, discussed (and implemented) ad nauseam throughout nearly every application that is maintained by the OpenBSD project.

http://niels.xtdnet.nl/papers/privsep.pdf

http://www.citi.umich.edu/u/provos/ssh/privsep.html

https://www.openbsd.org/papers/ven05-deraadt/index.html

https://www.openbsd.org/innovations.html

Re:Show HN: OpenBSD Email Service – A free-email alternative by hapless on Sunday February 18, 2018 @12:26PM (#16407060)
Privilege separation is also a nice feature, but it is not the same as MAC.

I would have much greater confidence in an OpenBSD project that included lomac or capsicum.