What is the reason for putting IP vps on spam lists?

Question

linux

Good.

Gentlemen, I'm catching abuzy. Situation: I raise vps on one well-known hosting, drive in settings and raise openvpn. Distribution - debian 9. Ports 21, 22, 25 - closed. Password access is closed, only by key. Ssh access is allowed to only one IP. nmap scan protection enabled. Fail2ban is installed and enabled. Next, work with content on sites via vpn (no mailing) and delete the server. For everything about everything - 20 minutes maximum. More detailed settings here . At the very working machine Arch - ie. We don't even need to talk about viruses. The system was checked for rootkits using chkrootkit and rkhunter.
I can’t figure out where I’m making holes, what spammers are getting through and what extras to include / put in ...

Thank you in advance.

Answer 1

I raise vps on one well-known hosting

1. you have a bus IP
   
2. the abuse should contain logs and generally describe the essence of the claim