Hi.
Not the mail gateway but was looking at their VM solution for a server project I have had on the back burner for a while now. I tried the VM tools and they were reasonably usable so suspect the same is true for the mail gateway.
I would say though running your own mail gateway these days is fairly arduous with respect to getting your email accepted at the other end. Most businesses I work with are sending out through a SaaS solution, even if they need to get the mail processed using an on-prem style gateway appliance, they send it out through the SaaS service as the last hop.
Andrew.
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From: Eigeldinger Simon via Blind-sysadmins