Posthaste
A modern, fast & powerful OSS email workstation
Your email, delivered at Posthaste.
Posthaste is a powerful, smart OSS email workstation. Check it out at https://posthaste.theor.net. Posthaste features offline optimism, smart commmands & rules and JMAP support! Posthaste is easy to use, easy to install, and easy to make yours. Posthaste draws inspiration from projects like MailMate (https://freron.com/).
I’ve worked on Posthaste alone for 3 months in Spring / Summer of 2026. Currently, the development is paused. Posthaste is around 180k LOC, and can be used as a daily driver for email. Some of the more ambitious features have been trimmed in favor of simplicity or code quality.
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