MarsSeed [1] filed a deletion request for syncmaildir [2]: Broken orphan from 2019. Upstream is EOL since 2020, and repo is archived [a] As per last AUR maintainer's comment, isync is a viable alternative, and it is available in Arch/extra repo. [a]: http://github.com/gares/syncmaildir/commits/master [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/syncmaildir/