In your WordPress you don’t know how many broken links you have in your site, So if you download the Broken Link Checker plugin than this plugin than it will let you know how many broken links you have in your WordPress.
But what if someone clicks on a link and ends up on the 404-page, so here is a great solution for you that you need to Download the HTTP 404 Email Notifier WordPress Plugin which will email you 404-links with the desired information of page, IP Address of visitor, Browser, referral URL from where he/she ends up on the 404-page.
This is one of the most important plugin for all WordPress users that every user must have.This plugin also have administration screen. This plugin does not add a page in your WordPress settings. It works with your Admin Email ID which you set in your WordPress blog and let you send emails when plugin found 404 Link.