Professional Email Newsletter Banner

I need a polished banner that will sit at the top of an upcoming email newsletter and simply present key information—no hard-selling, just a clear, professional visual that aligns with our brand’s clean aesthetic. The finished graphic must load quickly in common email clients, remain sharp on both desktop and mobile, and balance imagery with concise text that I’ll supply. Please deliver the final artwork in a PNG (for use) and an editable source file so I can tweak dates or headlines later if needed. If you have questions about dimensions or colour guidelines, let me know right away so we can lock them in before you start.