On Sun, May 16, 2021 at 02:24:59AM +0900, Kiyoung Park wrote: > Maybe I've deleted {tmp,new} dir since they are empty. > and without them the dir is not recognized as maildir. > After making {tmp,new} dirs for every mailbox, it now works. Yeah, they are part of the spec and mandatory. Glad you figured it out. Cheers, Reto