Yes I host my own email infrastructure for my own business and personal use. The "plumbing" is IMO trivial. I have no delivery issues.
The headache is with people who want to do things which aren't in my "acceptable use" envelope. I know there are adversaries out there ranging from the simply venal and self-righteous to the outright evil. That ranges from spam to tracking to phishing to malware delivery; and from scanning for open relays to credential stuffing to SYN attacks and more.
I actively map and target adversary infrastructure (and sometimes the "friendlies" are useful idiots). I use and encourage the use of 1:1 email aliases (I wrote and support TruAlias). I mess with DNS; I mess with L2. So around here if something doesn't work, you'd better ask me or your designated contact if you're expecting it to. There is no privacy around DNS or netflow info on my network.
My support issues are largely people-driven / political, which shouldn't be surprising given the above. However overall the support and IR load is light and the most problematic and chronic interlopers are the self-entitled aaS providers themselves.
The headache is with people who want to do things which aren't in my "acceptable use" envelope. I know there are adversaries out there ranging from the simply venal and self-righteous to the outright evil. That ranges from spam to tracking to phishing to malware delivery; and from scanning for open relays to credential stuffing to SYN attacks and more.
I actively map and target adversary infrastructure (and sometimes the "friendlies" are useful idiots). I use and encourage the use of 1:1 email aliases (I wrote and support TruAlias). I mess with DNS; I mess with L2. So around here if something doesn't work, you'd better ask me or your designated contact if you're expecting it to. There is no privacy around DNS or netflow info on my network.
My support issues are largely people-driven / political, which shouldn't be surprising given the above. However overall the support and IR load is light and the most problematic and chronic interlopers are the self-entitled aaS providers themselves.