There’s no specific timeline. Right now I’m waiting on a confirmation that Lose mail after commit: Upgrade TLS settings · Issue #1705 · mail-in-a-box/mailinabox · GitHub is resolved, then we’ll bump to the latest Nextcloud and Roudcube (again), test a bit more, and then release.
Is there a way to donate to help with the project?
Thank you. But no. See Would you contribute 💰 to Mail-in-a-Box, and what would you want it used for?.