[mastazi]

I self-host on a small-ish VPS. I don't really have to deal with spam, mail-in-a-box comes with pre-configured spamassassin. I haven't had issues with deliverability. When I created the box I did a scan of the IP and domain, found out that one antispam provider was blocking my IP, I sent a request to unblock it explaining this is my new IP I just acquired, they unblocked it. That was the last time I had to deal with deliverability issues, in any case I have an automated warning that I set up on MxToolBox. Let me know if you have more questions.