Hello,

I have this strange situation on nested mailboxes (directories)

# dovecot --version 2.2.36 (1f10bfa63)

# doveconf -n

# 2.2.36 (1f10bfa63): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.24 (124e06aa) # OS: Linux 3.10.0-693.21.1.el7.x86_64 x86_64 CentOS Linux release 7.5.1804 (Core)

mail_access_groups = vmail mail_location = maildir:%h mail_plugins = quota stats quota_clone mailbox_list_index = yes managesieve_sieve_capability = fileinto envelope encoded-character subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body environment mailbox date index ihave duplicate mime foreverypart extracttext namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = INBOX. separator = . type = private }

protocols = imap lmtp pop3 sieve

service imap-login { inet_listener imap-dsync { port = 1143 } inet_listener imap { port = 143 } inet_listener imaps { port = 993 ssl = yes } process_limit = 300 process_min_avail = 1 } service lmtp { inet_listener lmtp { port = 24 } process_min_avail = 5 } service managesieve-login { inet_listener sieve { port = 4190 ssl = yes } process_min_avail = 5 } service pop3-login { inet_listener pop3-dsync { port = 1110 } inet_listener pop3 { port = 110 } inet_listener pop3s { port = 995 ssl = yes } process_limit = 300 process_min_avail = 1 }

service stats { fifo_listener stats-mail { group = vmail mode = 0600 user = vmail } fifo_listener stats-user { group = vmail mode = 0600 user = vmail } } protocol lmtp { mail_plugins = quota stats quota_clone sieve } protocol imap { imap_client_workarounds = delay-newmail tb-extra-mailbox-sep mail_max_userip_connections = 50 mail_plugins = quota stats quota_clone imap_quota imap_stats } protocol sieve { mail_max_userip_connections = 10 } protocol pop3 { mail_plugins = quota stats quota_clone pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_enable_last = yes }

# ls -1a (Mailbox structure)

cur dovecot.index dovecot.index.cache dovecot.index.log dovecot.list.index dovecot.list.index.log dovecot.mailbox.log dovecot-uidlist dovecot-uidvalidity .Drafts .Junk maildirfolder maildirsize new .Received 1.1522486 - Subdirname.Received .Received 1.1522486 - Subdirname.Sent .Sent sieve subscriptions tmp .Trash .Trash.Sent (2)

# doveadm mailbox list -u name@domain.com INBOX INBOX.Trash INBOX.Trash.Sent (2) INBOX.Sent INBOX.Received 1 INBOX.Received 1.1522486 - Subdirname INBOX.Received 1.1522486 - Subdirname.Sent INBOX.Received 1.1522486 - Subdirname.Received INBOX.Junk INBOX.Drafts

# doveadm mailbox status -u name@domain.com -t all INBOX.* doveadm(name@domain.com): Error: Mailbox INBOX.Received 1: Failed to lookup mailbox status: Mailbox doesn't exist: INBOX.Received 1 doveadm(name@domain.com): Error: Mailbox INBOX.Received 1.1522486 - Subdirname: Failed to lookup mailbox status: Mailbox doesn't exist: INBOX.Received 1.1522486 - Subdirname messages=16 recent=0 unseen=1 vsize=3432379

The problem is that it's not possible to move this mailbox between servers using dovecot dsync/imapc. But I can see the messages inside these mailboxes using external IMAP/POP clients.