I mean SMTP servers with no reputation. I've been running my own server for years, but I never looked much into it, I am led to believe that the server must have good reputation to avoid spam lists, is that not so?
An IP gets on spam lists if spam is sent out from that IP, or, sometimes, another "nearby" address. You can't get a good reputation, you're just on one or more spam lists, or you're not. Doesn't matter how long you've been around.
