simonrob/email-oauth2-proxy

Headless email client

Proton Mail Bridge application

CLI to manage emails

Privacy-focused encrypted email for everyone. All-in-one alternative to Gmail + Mailchimp + Sendgrid.

A reverse proxy that provides authentication with Google, Azure, OpenID Connect and many more identity providers.

The SimpleLogin back-end and web app

Outlookmail Plus: Designed Specifically for Registration | Outlookmail Plus：专为注册而生 |

Imapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website is

Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)