mailpile/Mailpile ? reverse-engineered prompt

Build me a lightweight web based email client like Mailpile, focused on privacy and easy encrypted email.

I want a clean interface where a user can connect an IMAP and SMTP account, read and send mail, search through messages quickly, organize mail with tags or labels, and handle PGP signed and encrypted messages in a simple way. It should feel like something you can run locally in a browser, but also work on a personal server. Please include the basic command line or developer access if it fits naturally.

Keep the experience simple and friendly, with good default views, message search, tagging, and some automatic sorting for incoming mail. If you need to check anything, look up current docs online, but stay true to the existing project goals and keep it practical rather than overcomplicated.