Email Clients

Discover free, open-source, and secure email clients, along with some email alternatives you may not have considered.


When using end-to-end encryption (E2EE) technology like OpenPGP, email will still have some metadata that is not encrypted in the header of the email. Read more about email metadata.

OpenPGP also does not support Forward secrecy, which means if either your or the recipient's private key is ever stolen, all previous messages encrypted with it will be exposed. How do I protect my private keys?

Rather than use email for prolonged conversations, consider using a medium that does support Forward secrecy.

Recommended Instant Messengers

Desktop Email Clients


Thunderbird logo Thunderbird is a free, open source, cross-platform email, newsgroup, news feed, and chat (XMPP, IRC, Twitter) client developed by the Thunderbird community, and previously by the Mozilla Foundation.


Mailvelope logo Mailvelope is a browser extension that enables the exchange of encrypted emails following the OpenPGP encryption standard.

Worth Mentioning

Mobile Email Clients

Android Email Clients


FairEmail logo FairEmail is a minimal, open source email app, using open standards (IMAP, SMTP, OpenPGP) with a low data and battery usage.

K-9 Mail

K-9 Mail logo K-9 Mail is an independent mail application that supports both POP3 and IMAP mailboxes, but only supports push mail for IMAP.

iOS Email Clients

Canary Mail

Canary Mail logo Canary Mail is a paid email client designed to make end-to-end encryption seamless with security features such as a biometric app lock. Closed source

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