The installation and configuration is very simple:

After the installation you can configure the plugin: You can enter the email addresses to be blocked directly in the plugin settings – one address per line. Alternatively, enter the email address ranges and domains via regex pattern: e.g. with .*@.*.ru you exclude all Russian email addresses

Supplement: With the update 3.0.3 you can also check the postal code. For this purpose, a free text field was added in the basic settings at the respective country. This can be found in each case next to the pen for editing the country, as a separate icon.

Explanation for checking the German zip code:

([0]{1}[1-9]{1}|[1-9]{1}[0-9]{1})[0-9]{3}

If the ZIP code starts with a 0 AND has a 1 through 9 as the second digit OR if it starts with a 1 through 9 AND then has a 0 through 9 AND the remaining three digits also have a 0 through 9, everything is fine.