Alex Mills

When it comes to spam and <a href="https://codex.wordpress.org/Introduction_to_Blogging#Pingbacks" rel="nofollow ugc">pingbacks</a>/<a href="https://codex.wordpress.org/Introduction_to_Blogging#Trackbacks" rel="nofollow ugc">trackbacks</a>, the vast majority by far is via trackbacks rather than pingbacks. Very, very few people use trackbacks for legitimate uses anymore (I’ve gotten less than 5 in the last 8 months) as WordPress, etc. all use pingbacks now as their primary ping method.
I had already installed <a href="http://ocaoimh.ie/cookies-for-comments/" rel="nofollow ugc">Cookies For Comments</a> which successfully stops most spam comments but I still had to deal with the tons of trackback spam. So, I wrote this plugin.
It will disable new trackbacks across your site, both legitimate and spam. However since very few people use trackbacks legitimately, this combined with Cookies For Comments should cut your spam down to next to zero.
Why should I use this plugin over one of those trackback validator plugins?
Most non-Akismet style anti-trackback spam plugins work by connecting to the URL that sent the trackback and looking for a link to your blog. The problem with this is that many spammers actually post links to your blog in their spam posts rendering those types of plugins useless. Even those that check the IP address to make sure it matches are beaten by spam blogs (aka splogs).
In the end it’s up to you what to use for anti-spam, but I personally use Cookies For Comments, this plugin, and then Akismet to catch anything that makes it through.

Disable Trackbacks

Globally disables trackbacks to cut down on spam. Very, very few people legitimately use trackbacks and spammers love them, so it's worthy tradeo …

Blogestudio

Pau Iglesias

When your blog posts receive pingbacks and trackbacks usually they are displayed together with user opinions.
But if you don’t like to see this additional data, or you think pingbacks and trackbacks are not valuable for your blog, here is a tool to remove them.
This plugin allows you to delete all pingbacks and trackbacks comments from your blog, leaving only user comments.
Furthermore turns to closed the ping status of existing posts still allowing new notifications, avoiding them future pingbacks or trackbacks.
And for new posts, to avoid more notifications, updates the default post ping status value to closed (this option is available in Discussion Settings section).
Full support for any kind of custom post types. There is a filter for developers if you want to exclude a particular post type.
This plugin provides a single one step form to do these changes, but previously it’s strongelly recommended you perform a database backup.
Once completed this process, you will not receive more pingbacks or trackbacks unless you do not change posts or blog notifications configuration.

Remove Pingback-Trackback Comments

One step process to remove pingbacks and trackbacks and leave only real user opinions in your posts comments.

Disable Trackbacks vs Remove Pingback-Trackback Comments