<ul>
<li>When judging that Akismet is SPAM when the comment is processed</li>
<li>When marking it as SPAM in the comment section of the dashboard</li>
<li>When you make the approval status SPAM when the comment section of the dashboard edits the comment</li>
</ul>
List IP address from the database in case of the above-mentioned, and Deny the IP address. .htaccess is updates.
It changes in the comment block from
BEGIN written by WordPress plugin – Akismet htaccess writer
to
END written by WordPress plugin – Akismet htaccess writer
in the content of the .htaccess file.
After the .htaccess file, it is written in the tail when the block identifier is not found.
***** Please do not do the contact to the author of the Akismet plug-in for this plug-in *****

Akismet htaccess writer

in connection with Akismet, write in a .htaccess file

Per Søderlind

Based on a users IP address, WP-DenyHost will block a spammer if he already has been tagged as a spammer. Use it together with the Akismet plugin. Akismet tags the spammer, and WP-DenyHost prevents him from accessing you site.
If you have a <a href="https://www.cloudflare.com" rel="nofollow ugc">CloudFlare</a> account, the plugin can add spamers to <a href="https://www.cloudflare.com/threat-control" rel="nofollow ugc">CloudFlare Block list</a>

WP-DenyHost

WP-DenyHost denies a spammer from accessing your WordPress site. WP-DenyHost can add spammers to the CloudFlare Block list

Akismet htaccess writer vs WP-DenyHost