And RBLs aren't that great. I visited this in January of 2018 [1] and in my case (where I do greylisting [2][3]but nothing else for spam) it wouldn't help.
[3] And yes, I do run my own server. It's just for me, so I have no issues with "customer requests" and I've been using the same IP address for about a decade (maybe more). Then again, I've been running my own email sever since 1998.
[1] http://boston.conman.org/2018/01/10.1
[2] https://en.wikipedia.org/wiki/Greylisting
[3] And yes, I do run my own server. It's just for me, so I have no issues with "customer requests" and I've been using the same IP address for about a decade (maybe more). Then again, I've been running my own email sever since 1998.