Do this only work with normal registration form?

Do this plugin only work with normal WP registration procedure?

Yes, it only works with WordPress’ normal registration procedure. Any custom plugin that allows signup should still be using it, however, as the proper procedure is to hook into WP’s scripts, not reinvent the wheel.

Thanks for explaining Mika.
Apparently this plugin is not using Wp defaults since your plugin do not catch anything from this.

You don’t by any chance know of a plugin that can block these emails from being stored in the database when a user signs up?

Which plugin are you using for an alternative registration? Since pretty much all plugins that do what Ban-Hammer does assume the registration is via the normal ways, it’s hard to recommend anything unless I know what reg plugin you are using ??

It is a manually coded custom plugin I got made for the site specifically. Yes I should contact the developer directly but that is just not possible anymore.

I am not aware of how the plugin addresses the signup at WP, it might just inject the user directly into the Db?

So it is more a question of is there any plugin that can prevent data being stored directly in the Db only based on the IP/E-mails I type in should be blocked?

I am not aware of how the plugin addresses the signup at WP, it might just inject the user directly into the Db?

If it does that, then there’s NO way this plugin would work. You’d have to write a filter for it to be intercepted, check the ban, and go from there.

Possibly the Woo Example I have here – https://github.com/Ipstenu/ban-hammer/wiki#woocommerce – may help you?