[Plugin: Useful 404’s] email notification

Does you blog send other email notifications? You may have an issue with your server not allowing mail to be sent. If so, try using an alternative mailer plugin – https://www.ads-software.com/extend/plugins/search.php?q=mailer

I am getting numerouse email notifications on broker links, though the site is operating normally. For example, I get a notification on an image that is display properly on the page. Why would I get so many links reporting like this?

Found a problem, will break my links or redirect to a different page. Disabled the plugin and links are back to normal.

I have the same issue no emails sent I received the welcome email on installing wordpress but no 404 emails ? any way to trouble shoot.