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An SSL Certificate is a digital certificate that authenticates a website with browsers and search engines, and allows the site to have an encrypted connection. A lapsed certificate license will usually result in a loss of traffic as warnings for users block entry to the site.

Email Bounces are emails that don’t deliver. This can be due to several potential reasons, including deleted email addresses, those that are typed incorrectly, inboxes that aren’t monitored and are full, unable to accept new messages, or those with strict filters that block certain message types.

A 404 error is a website status code indicating that a webpage cannot be found on the server. This is typically because the page has been removed or moved, but the old URL hasn’t been redirected to the new location.

404 errors should be monitored for and removed when found, but it’s often tough to catch all of them on large or older websites. Designing a 404 page that apologizes to the user in an amusing way and provides them with some resources to help them find what they’re looking for can be a great way not to lose credibility on your site.