Open Source Alternatives to Gmail

Thunderbird isn’t a hosted email service like Gmail, but it’s the standard open source answer for reducing dependence on Google’s mail infrastructure: a free, standards-based client that connects to any IMAP or POP3 provider, including a self-hosted mail server, without routing your reading habits through Google’s systems. It supports built-in OpenPGP encryption, an add-on ecosystem, and full account portability, so you can pair it with a privacy-focused mail provider instead of Gmail while keeping a familiar desktop mail experience. What it doesn’t replace is Gmail’s server-side spam filtering and search infrastructure — those depend on whichever mail provider you connect Thunderbird to.