As an experienced web developer, I recognize and value the importance of functionality and productivity within WordPress sites. On reviewing your project description, I see that you're facing a fatal error issue with your email_customizer plugin. I possess deep expertise in PHP and WordPress, making me well-suited to identify and rectify this problem for you.
Over the course of my 11+ year career , I have successfully managed similar challenges on numerous sites, ensuring smooth-running back-ends and optimum user experiences. Earlier in my career, I worked with various MNCs where I gathered invaluable experience in troubleshooting WordPress site issues of all complexities.
Finally, what sets me apart is my thorough understanding of the business-driven technology landscape: my unique approach combines creativity with the needs of your target audience. Throughout our collaboration, you can expect transparency, effective communication, and timely delivery of the solutions you need. It would be a privilege to help restore your site's functionality and optimize its performance. Let's get started!