Email system must be simple and implemented in a basic/clean HTML format, allowing all parts of every page to be easily selected as text and copied to the clipboard. It should not rely on app-based platforms, which tend to perform poorly over browsers other than Google Chrome and often encounter issues with compatibility, performance, or loading.
Having used Yahoo Mail as my primary email provider for many (near 30) years, you understand how difficult it can be to migrate to another platform. However, Yahoo frequently introduces new incompatibilities that hinder usability. Therefore, the email service must work seamlessly across all browsers, including SeaMonkey and all versions of Firefox, even those compatible with Windows XP.
Users do not expect email to be a complex interface or a resource-intensive application. A straightforward core functionality: displaying text, organizing into folders, and a simple editor is sufficient. These are fundamental IT requirements for every one and must be accessible everywhere with minimal hardware requirements.