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I also tend to blacklist swaths of IP addresses when owners relay spammers.
It's been awhile since I admin'ed a network, but we actually had long lists.
We did a lot custom, because spammers hate to deal with custom work. It's a lot of effort for no great advantage.
We used to list the spammer IPs on a separate database. That way any emails that got through, they could be tagged as "spamming sources" so the end user would be alerted to the possibility of a spam or phishing attack.
As things got more rancorous we used to locate their service provider sales email addresses, and auto-forwarded all spam to the provider for resolution.
It can make a spammer angry though, if he can figure out who's doing it.
There's a lot you can do with a bit of programming.
Feedback response number WEBBACFHU4 created by ~Sigmund Umwemanoni on 08/02/2016