What is the SendGrid WordPress Plugin?
SendGrid’s cloud-based email infrastructure relieves businesses of the cost and complexity of maintaining custom email systems. SendGrid provides reliable deliverability, scalability, and real-time analytics along with flexible APIs that make custom integration with your application a breeze.
SendGrid’s WordPress plugin replaces WordPress’s default wp_mail() function by using either an SMTP or API integration with SendGrid to send outgoing email from your WordPress installation. It also allows you to upload contacts directly to your SendGrid Marketing Campaigns account via a subscription widget.
Settings page just flickers thus plugin non functional