3,500 spam comments in 3 days?

If The Spam is being Fired from single IP As I suspect Just Block That IP

If You are being spammed from a network.Good Plugins are available at wordpress.

Spammers list are being tracked here
https://www.projecthoneypot.org/list_of_ips.php

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Cheers
Alok

Install this plugin as I have zero spam comments or signups on my website

https://www.ads-software.com/extend/plugins/block-spam-by-math-reloaded/

@mralokkp : Thank you for your suggestion, but they were coming froming all sorts of IP’s.

@govpatel : That plugin is perfect, thank you very much!

If you don’t like captcha, try Bad Behavior and Cookies for Comments. Also make sure you’re using Akismet!

I’ve had 1 spam get through in the last couple months with that combo.

You are welcome this works better then capcha

https://www.ads-software.com/extend/plugins/cookies-for-comments/
This plugin stops most automated spam bots

It’s a far better solution that any sort of captcha/math input (which are easily fooled, and inaccessible)

captchas and math things are 100% useless against spambots targeting your comment url…..

@ipstenu was far quicker on the draw!!!!!

Super powers! ??

Another aproach
https://www.yoursite.com/wp-admin/options-discussion.php
https://tinypic.com/r/2ibyoec/7