I am running mailcow for about 7 years now and it worka fine. Sometimes some exchange server refuses to send my email. But it is pretty rare. Of course I had to

I am running mailcow for about 7 years now and it worka fine. Sometimes some exchange server refuses to send my email. But it is pretty rare. Of course I had to set up SPF and DKIM. I think it happened once that I was grey listed. You.can request removal of such entry. In general I do not have much problem with it. Most of the work is for migration from machine to another machine.