If you own a product, send a newsletter, or handle users like I do for myself and my clients, you would know that email verification is an integral part of managing emails. The Email Verification API by WhoIsXMLAPI is a solid email validation API which makes use of an extensive WhoIs database combined with smart algorithms to validate the email addresses. It checks the given email address against multiple layers to verify it. Also, it fights the spam and disposable email addresses as well.
Invoicing is a free and lightweight WordPress plugin by the team which developed WPGeoDirectory. The plugin is super fast which allows you to create invoices, receive payments, and generate reports right at one place.
As the computing power and tech are evolving rapidly, sites are becoming more and more vulnerable. SMART Plus by SiteLock scans your site for possible file-based malware & vulnerabilities and automatically fixes the core files. It also offers WordPress Database Protection from malware and spam keywords.