Concerning blacklisted IP...it's a server that hosts multiple domains and I'm not responsible for the other domains.
True, but a IP block will effect your domain as well as the others.

But the main reason for the block is that you are using afraid.org.
As long as you are using that, avast will not allow your domain:
https://forum.avast.com/index.php?topic=148018.msg1075293#msg1075293