Hi ByteMe,

Try changing the separator from / to .

Best regards, Piotr Szafarczyk

On 04/12/2025 11:50, byteme--- via dovecot wrote:

My configuration on new system:

2.4.1-4 (7d8c0e5759): /etc/dovecot/dovecot.conf

Pigeonhole version 2.4.1-4 (0a86619f)

OS: Linux 6.12.57+deb13-amd64 x86_64 Debian 13.2 ext4

dovecot_config_version = 2.4.1 acl_driver = vfile auth_allow_weak_schemes = yes auth_debug = yes auth_debug_passwords = yes auth_username_format = %{user|lower} auth_verbose = yes doveadm_password = # hidden, use -P to show it doveadm_port = 12345 dovecot_storage_version = 2.4.1 fts_autoindex = yes fts_autoindex_max_recent_msgs = 999 fts_search_add_missing = yes info_log_path = /var/log/dovecot/dovecot-info.log listen = * log_path = /var/log/dovecot/dovecot.log log_timestamp = "%Y-%m-%d %H:%M:%S " login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k mail_debug = yes mail_driver = maildir mail_home = /var/vmail/%{user | domain}/%{user | username } mail_inbox_path = . mail_max_userip_connections = 500 mail_path = /var/vmail/%{user | domain}/%{user | username }/ mail_plugins = notify quota push_notification quota_clone acl fts fts_solr mail_privileged_group = mail protocols { imap = yes sieve = yes lmtp = yes pop3 = yes } quota_exceeded_message = Benutzer %{user} hat das Speichervolumen ueberschritten. / User %{user} has exhausted allowed storage space. sieve_global_extensions { vnd.dovecot.pipe = yes } sieve_max_redirects = 10 sieve_max_script_size = 1M sieve_plugins { sieve_imapsieve = yes sieve_extprograms = yes } sql_driver = mysql ssl_cipher_list = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305 verbose_proctitle = yes mysql /var/run/mysqld/mysqld.sock { dbname = postfix password = # hidden, use -P to show it user = postfix } passdb sql { query = SELECT username AS user, CONCAT('{CRYPT}', password) AS password FROM mailbox WHERE username = '%{user}' AND active = true; } userdb sql { iterate_query = SELECT username AS user FROM mailbox WHERE active = true; query = SELECT 5000 AS uid, 5000 AS gid, CONCAT('/var/vmail/', SUBSTRING_INDEX(username,'@',-1), '/', SUBSTRING_INDEX(username,'@',1)) AS home, CONCAT('maildir:/var/vmail/', SUBSTRING_INDEX(username,'@',-1), '/', SUBSTRING_INDEX(username,'@',1)) AS mail, CONCAT(quota,'M') AS quota_storage_size FROM mailbox WHERE username = '%{user}' AND active = true; } namespace inbox { inbox = yes prefix = .INBOX. separator = / type = private mailbox Drafts { special_use = "\\Drafts" } mailbox Archive { } mailbox Junk { special_use = "\\Junk" } mailbox Sent { special_use = "\\Sent" } mailbox Trash { special_use = "\\Trash" quota_storage_extra = 100M quota_storage_percentage = 110 } mailbox "Sent Messages" { special_use = "\\Sent" } } namespace shared { list = yes prefix = Shared. separator = . subscriptions = yes type = shared } namespace public { list = yes prefix = Public. separator = . subscriptions = yes type = public mailbox Announcements { auto = subscribe } } service imap-login { inet_listener imap { } inet_listener imaps { } } service pop3-login { inet_listener pop3 { } inet_listener pop3s { } } service submission-login { inet_listener submission { } } service imap { executable = imap process_limit = 1024 process_min_avail = 2 vsz_limit = 1G } service pop3 { } service submission { } service auth { user = root unix_listener /var/spool/postfix/private/auth_dovecot { group = postfix mode = 0660 user = postfix } unix_listener auth-master { mode = 0600 user = vmail } unix_listener auth-userdb { mode = 0600 user = vmail } } service auth-worker { } service dict { unix_listener dict { group = vmail mode = 0660 user = vmail } } ssl_server { cert_file = /etc/letsencrypt/live/mx1.germany.com/fullchain.pem key_file = /etc/letsencrypt/live/mx1.germany.com/privkey.pem } service doveadm { inet_listener doveadm_listener { port = 12345 } } protocol imap { imap_idle_notify_interval = 29 mins mail_max_userip_connections = 50 mail_plugins = quota quota_clone imap_quota imap_acl acl fts fts_solr } protocol lmtp { auth_socket_path = /var/run/dovecot/auth-master mail_plugins { sieve = yes notify = yes push_notification = yes } postmaster_address = postmaster@germany.com } service managesieve-login { process_min_avail = 2 vsz_limit = 128 M inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } } service managesieve { process_limit = 256 } protocol sieve { managesieve_logout_format = bytes=%i/%o managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext } dict_server { dict mysql { driver = sql sql_driver = mysql dict_map priv/quota/messages { sql_table = quota username_field = username dict_map_value_field messages { } } dict_map priv/quota/storage { sql_table = quota username_field = username dict_map_value_field bytes { } } } } acl_sharing_map { dict file { path = /var/vmail/shared-mailboxes.db } } quota "User quota" { driver = count storage_size = 1G } quota_clone { dict proxy { name = mysql } } sieve_script personal { active_path = /var/vmail/sieve/%{user | domain }/%{user | username }/active-script.sieve driver = file path = /var/vmail/sieve/%{user | domain }/%{user | username }/scripts type = personal } sieve_script global { driver = file path = /var/vmail/sieve/global.sieve type = before } sieve_script spam-global { path = /var/vmail/sieve/global/spam-global.sieve type = before } imapsieve_from Spam { sieve_script ham { cause = copy path = /var/vmail/sieve/global/learn-ham.sieve type = before } }

On the old system Bookworm an Dovecot 2.3 it looks like:

2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf

Pigeonhole version 0.5.19 (4eae2f79)

OS: Linux 6.1.0-40-amd64 x86_64 Debian 12.12

dict { sqlquota = mysql:/etc/dovecot/dovecot-dict-sql.conf } doveadm_password = # hidden, use -P to show it doveadm_port = 12345 info_log_path = /var/log/dovecot/dovecot-info.log listen = * log_path = /var/log/dovecot/dovecot.log log_timestamp = "%Y-%m-%d %H:%M:%S " login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k mail_home = /var/vmail/%d/%n mail_location = maildir:~/ mail_max_userip_connections = 500 mail_plugins = quota acl fts fts_solr mail_privileged_group = mail managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext namespace { list = yes location = maildir:%%h/:INDEXPVT=~/Shared/%%u prefix = Shared/%%u/ separator = / subscriptions = no type = shared } namespace inbox { inbox = yes location = mailbox Archief { special_use = \Archive } mailbox Archiv { special_use = \Archive } mailbox Archive { auto = subscribe special_use = \Archive } mailbox Archives { special_use = \Archive } mailbox Arquivo { special_use = \Archive } mailbox Arquivos { special_use = \Archive } mailbox Brouillons { special_use = \Drafts } mailbox Concepten { special_use = \Drafts } mailbox Corbeille { special_use = \Trash } mailbox "Deleted Items" { special_use = \Trash } mailbox "Deleted Messages" { special_use = \Trash } mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Entwürfe { special_use = \Drafts } mailbox Enviados { special_use = \Sent } mailbox Envoyés { special_use = \Sent } mailbox "Gelöschte Objekte" { special_use = \Trash } mailbox Gesendet { special_use = \Sent } mailbox "Gesendete Objekte" { special_use = \Sent } mailbox "Itens Enviados" { special_use = \Sent } mailbox "Itens Excluídos" { special_use = \Trash } mailbox "Itens Excluidos" { special_use = \Trash } mailbox Junk { auto = subscribe special_use = \Junk } mailbox "Junk E-mail" { special_use = \Junk } mailbox Lixeira { special_use = \Trash } mailbox "Lixo Eletrônico" { special_use = \Junk } mailbox "Messages envoyés" { special_use = \Sent } mailbox "Ongewenste e-mail" { special_use = \Junk } mailbox Papierkorb { special_use = \Trash } mailbox Prullenbak { special_use = \Trash } mailbox Quarantine { auto = subscribe comment = Mail containing viruses } mailbox Rascunhos { special_use = \Drafts } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Items" { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Spam { special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } mailbox "Verwijderde items" { special_use = \Trash } mailbox Verzonden { special_use = \Sent } mailbox "Verzonden items" { special_use = \Sent } prefix = separator = / } passdb { driver = pam } passdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } plugin { acl = vfile acl_anyone = allow acl_shared_dict = file:/var/vmail/shared-mailboxes.db mail_replica = tcp:192.168.2.6 quota = dict:Userquota::proxy::sqlquota quota_rule2 = Trash:storage=+100%% recipient_delimiter = + sieve = /var/vmail/%d/%n/sieve/active-script.sieve sieve_before = /var/vmail/sieve/global.sieve sieve_dir = /var/vmail/%d/%n/sieve/scripts/ sieve_max_script_size = 1M sieve_quota_max_scripts = 0 sieve_quota_max_storage = 0 } protocols = imap sieve lmtp pop3 replication_dsync_parameters = -d -n INBOX -l 30 -U replication_full_sync_interval = 2 mins service aggregator { fifo_listener replication-notify-fifo { user = vmail } unix_listener replication-notify { user = vmail } } service auth { unix_listener /var/spool/postfix/private/auth_dovecot { group = postfix mode = 0660 user = postfix } unix_listener auth-master { mode = 0600 user = vmail } unix_listener auth-userdb { mode = 0600 user = vmail } user = root } service dict { unix_listener dict { group = vmail mode = 0660 user = vmail } } service doveadm { inet_listener { port = 12345 } } service imap { process_limit = 1024 vsz_limit = 1 G } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } user = vmail } service managesieve-login { inet_listener sieve { port = 4190 } process_min_avail = 2 service_count = 1 vsz_limit = 128 M } service managesieve { process_limit = 256 } service replicator { process_min_avail = 1 unix_listener replicator-doveadm { mode = 0600 user = vmail } } ssl_cert = </etc/letsencrypt/live/mx1.germany.com/fullchain.pem ssl_cipher_list = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305 ssl_key = # hidden, use -P to show it userdb { driver = passwd } userdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } verbose_proctitle = yes protocol lmtp { auth_socket_path = /var/run/dovecot/auth-master mail_plugins = quota sieve acl fts fts_solr postmaster_address = postmaster@germany.com } protocol imap { mail_plugins = quota imap_quota imap_acl acl fts fts_solr } protocol sieve { managesieve_logout_format = bytes=%i/%o } remote 127.0.0.1 { disable_plaintext_auth = no }

---

dovecot mailing list -- dovecot@dovecot.org To unsubscribe send an email to dovecot-leave@dovecot.org

Don't set mail_inbox_path (remove/comment out if its set by debian in conf.d). Your config does not need it. Namespace separator is not your issue.

Aki

 On 04/12/2025 16:01 EET byteme--- via dovecot <[1]dovecot@dovecot.org>
 wrote:


 That doesn't solve the problem.
 2025-12-04 14:57:37
 imap([2]test@example.com)<1517631><nsIetiBFyrp/AAAB>: Error: namespace
 configuration error: list=yes requires prefix=.INBOX. not to start with
 separator
 2025-12-04 14:58:01
 imap([3]systemmails@example.com)<1517854><aQuXtyBFHMZ/AAAB>: Error:
 namespace configuration error: list=yes requires prefix=.INBOX. not to
 start with separator
 _______________________________________________
 dovecot mailing list -- [4]dovecot@dovecot.org
 To unsubscribe send an email to [5]dovecot-leave@dovecot.org

References

Visible links

1. mailto:dovecot@dovecot.org
2. mailto:test@example.com
3. mailto:systemmails@example.com
4. mailto:dovecot@dovecot.org
5. mailto:dovecot-leave@dovecot.org

Looked ok otherwise.

Aki

 On 04/12/2025 17:03 EET byteme--- via dovecot <[1]dovecot@dovecot.org>
 wrote:


 Okay,
 what would be the right definition for namespace in my case?

 ByteMe
 _______________________________________________
 dovecot mailing list -- [2]dovecot@dovecot.org
 To unsubscribe send an email to [3]dovecot-leave@dovecot.org

References

Visible links

1. mailto:dovecot@dovecot.org
2. mailto:dovecot@dovecot.org
3. mailto:dovecot-leave@dovecot.org

...

...

...

...

"byteme---" == byteme--- via dovecot <dovecot@dovecot.org> writes:

Aki Tuomi wrote:

...

Looked ok otherwise. Aki That's good news, but it doesn't solve the problem of the previously invisible folders.

What is your current 2.3 configuration? It would be good to be able to compare them.

At first, please don't use private mails here. It will use the wrong folders here and will not be visible on the right context! John Stoffel wrote:

I have in my setup the following in my 2.3 config:

mail_location = maildir:/var/mail/%d/%n/Maildir

while from your recent email I see you have:

mail_home = /var/vmail/%d/%n mail_location = maildir:~/

Which implies to me that you don't push them down as far as I do into the directory tree. But that all looks good to me.

We talk here about a migration from Dovecot 2.3 to 2.4 and the newer version doesn't know mail_location = maildir:/var/mail/%d/%n/Maildir anymore. It throws errors. "mail_location" is unkown meanwhile. Dovecot 2.3 is running well, only Dovecot 2.4 doesn't show the origin folders and files.

mail_location = maildir:/var/mail/%d/%n/Maildir

converts into

mail_home = /var/mail/%{user|domain}/%{user|username} mail_driver = maildir mail_path = ~/Maildir

Aki

What would this convert to in 2.4x considering the indexes?

v2.3x: mail_home = /var/spool/email/%d/%n/_dovecot mail_location = maildir:/var/spool/email/%d/%n/_folders:INDEX=/var/spool/email/%d/%n/_dovecot:CONTROL=/var/spool/email/%d/%n/_dovecot plugin { sieve = file:~/../_sieve;active=~/../_sieve/.active_sieve }

The problem with dot-notation folders in Dovecot 2.3, which were no longer accepted in Dovecot 2.4, is SOLVED!

Solution:

systemctl stop dovecot

/usr/local/bin/migrate-dovecot-folders.sh

systemctl start dovecot

doveadm force-resync -u '*' '*'

Now there is another challenge: many individual user folders are not automatically displayed. This is automatically synchronized using the script "auto-subscribe-dovecot-folders.sh".

Afterward, all mailboxes will function as expected.

Here are the two scripts: #!/usr/bin/bash

migrate-dovecot-folders.sh

Usage:

./migrate-dovecot-folders.sh (dry-run)

./migrate-dovecot-folders.sh --apply (perform changes)

./migrate-dovecot-folders.sh --user user@domain (only that user)

set -euo pipefail

BASE="/var/vmail" DRY_RUN=1 ONLY_USER="" PRESERVE_CASE=1 # 1 = keep original case after .INBOX., 0 = TitleCase

if [[ "${1:-}" == "--apply" ]]; then DRY_RUN=0; shift; fi while [[ $# -gt 0 ]]; do case "$1" in --apply) DRY_RUN=0; shift ;; --user) ONLY_USER="$2"; shift 2 ;; --lower) PRESERVE_CASE=0; shift ;; *) echo "Unknown arg: $1"; exit 1 ;; esac done

log() { echo "$(date +'%F %T') $*" }

transform a source folder (basename) to target name

transform_name() { local src="$1"

if starts with .INBOX. => strip that prefix

if [[ "$src" =~ ^\.INBOX\.(.+) ]]; then local after="${BASH_REMATCH[1]}" if [[ $PRESERVE_CASE -eq 1 ]]; then echo "$after" else # Title case: replace separators and uppercase first letters echo "$after" | sed -E 's/[^A-Za-z0-9]+/ /g' | awk '{ for(i=1;i<=NF;i++){ $i = toupper(substr($i,1,1)) tolower(substr($i,2)) } ; print $0 }' | sed 's/ /_/g' fi return fi

otherwise strip leading dot

if [[ "$src" =~ ^\.(.+) ]]; then echo "${BASH_REMATCH[1]}" return fi

otherwise return unchanged

echo "$src" }

move/merge a mailbox subdir

move_folder() { local userdir="$1" # full path to user dir, e.g. /var/vmail/domain/user local srcname="$2" # basename e.g. .INBOX.Fail2ban local tgtname="$3" # basename e.g. Fail2ban

local src="$userdir/$srcname" local tgt="$userdir/$tgtname"

sanity checks

[[ -d "$src" ]] || { log "SKIP: src not dir: $src"; return 0; }

if [[ "$src" == "$tgt" ]]; then log "SKIP: source == target for $src" return 0 fi

if [[ $DRY_RUN -eq 1 ]]; then log "DRYRUN: would rename '$src' -> '$tgt'" return 0 fi

if target exists, merge contents

if [[ -d "$tgt" ]]; then log "Merging '$src' -> '$tgt'"

# move cur/new/tmp files (avoid clobbering same names)
for part in cur new tmp; do
  if [[ -d "$src/$part" ]]; then
    mkdir -p "$tgt/$part"
    # move files, avoid overwrite: use mv -n if available; otherwise loop
    if mv -n "$src/$part/"* "$tgt/$part/" 2>/dev/null; then
      true
    else
      # fallback: move one-by-one with unique suffix
      for f in "$src/$part/"*; do
        [[ -e "$f" ]] || continue
        base="$(basename "$f")"
        if [[ -e "$tgt/$part/$base" ]]; then
          # append PID timestamp
          mv "$f" "$tgt/$part/${base}.$(date +%s).$$"
        else
          mv "$f" "$tgt/$part/"
        fi
      done
    fi
  fi
done

# move dovecot.* files (index/cache/uidlist etc.) - if target has file, we keep target file
for f in dovecot.* maildirsize subscriptions mailbox*; do
  if [[ -e "$src/$f" && ! -e "$tgt/$f" ]]; then
    mv "$src/$f" "$tgt/"
  else
    # if both exist, prefer keeping target and remove src's file
    if [[ -e "$src/$f" ]]; then
      rm -f "$src/$f"
    fi
  fi
done

# remove now-empty src directories if empty
find "$src" -mindepth 1 -maxdepth 1 | read -r || rmdir --ignore-fail-on-non-empty "$src" || true
chown -R vmail:vmail "$tgt"
log "Merged done: $src -> $tgt"
return 0

fi

Otherwise simple rename

log "Renaming '$src' -> '$tgt'" mv "$src" "$tgt" chown -R vmail:vmail "$tgt" log "Renamed done: $src -> $tgt" }

iterate all user dirs

find_users() { if [[ -n "$ONLY_USER" ]]; then # Only process single user: split domain/user # user dir may be under /var/vmail/<domain>/<localpart or fulluser?> # try to find the exact directory find "$BASE" -mindepth 2 -maxdepth 3 -type d -path "*/$ONLY_USER" 2>/dev/null return fi

list user dirs: /var/vmail/<domain>/<user>

find "$BASE" -mindepth 2 -maxdepth 2 -type d -printf '%h/%f\n' 2>/dev/null }

Main

log "Starting migration script (DRY_RUN=$DRY_RUN) base=$BASE only_user=$ONLY_USER"

while IFS= read -r userdir; do [[ -n "$userdir" ]] || continue

ensure it's a user directory (has cur/new/tmp or maildirfolder)

if [[ ! -d "$userdir" ]]; then continue; fi

scan for dot-folders in that user dir

while IFS= read -r src; do srcbase="$(basename "$src")" # skip standard maildir parts case "$srcbase" in cur|new|tmp|Maildir|dovecot.*|subscriptions|maildirsize) continue ;; esac # select only directories starting with dot OR name equal to "INBOX" variants if [[ "$srcbase" =~ ^\. ]] || [[ "$srcbase" =~ ^INBOX ]]; then tgtbase="$(transform_name "$srcbase")" # if transform yields empty -> skip [[ -n "$tgtbase" ]] || continue # avoid converting e.g. ".INBOX" -> "" (keep INBOX) if [[ "$tgtbase" == "" ]]; then tgtbase="INBOX"; fi move_folder "$userdir" "$srcbase" "$tgtbase" fi done < <(find "$userdir" -mindepth 1 -maxdepth 1 -type d -printf '%p\n' 2>/dev/null) done < <(find_users)

log "Done. If not --apply then this was a dry-run. Verify and then run with --apply."

after running with --apply, run (per-user) reindex/resync, e.g.:

doveadm force-resync -u user@domain '*'

or for many users:

for u in user1@d; do doveadm force-resync -u '*' '*'; done

And: #!/bin/bash

auto-subscribe-dovecot-folders.sh

Automatically subscribes to all existing Maildir folders for all users.

BASE="/var/vmail" SYSTEM_FOLDERS=("Drafts" "Sent" "Junk" "Trash" "Archive" "Quarantine" "INBOX" "new" "cur" "tmp" "sieve")

echo "Starting auto-subscribe of non-system folders..."

Loop through all domains

for DOMAIN in "$BASE"/*; do [ -d "$DOMAIN" ] || continue DOMAIN_NAME=$(basename "$DOMAIN")

Loop through all users

for USERDIR in "$DOMAIN"/*; do [ -d "$USERDIR" ] || continue USERNAME=$(basename "$USERDIR") USER_EMAIL="$USERNAME@$DOMAIN_NAME"

echo "Processing user $USER_EMAIL..."

# Loop through all folders in the user directory
for MAILBOX in "$USERDIR"/*; do
  [ -d "$MAILBOX" ] || continue
  FOLDER=$(basename "$MAILBOX")
  
  # Check if it's a system folder
  SKIP=0
  for SYS in "${SYSTEM_FOLDERS[@]}"; do
    if [[ "$FOLDER" == "$SYS" ]]; then
      SKIP=1
      break
    fi
  done
  [ $SKIP -eq 1 ] && continue

  # Subscribe to mailbox
  echo "Subscribing $FOLDER for $USER_EMAIL..."
  doveadm mailbox subscribe -u "$USER_EMAIL" "$FOLDER"
done

done done

echo "Done."

This is working as desired now. I hope this helps everyone who is facing a similar problem.

ByteMe

You haven't provided a plausible solution to this claim yet. So, for me, it's just an unproven assertion! Okay?

Furthermore, you haven't provided a single working solution for our situation. If anything, we've only received brief statements, no explanation of why or how!

The fact is, it didn't work here! Therefore, "maildir++ style .foo.bar folders are totally still accepted by Dovecot 2.4" is an unproven and boastful claim. I've now found a solution.

Your complete upgrade from 2.3 to 2.4, which was supposed to run better than major release 3.0, is a disgrace in terms of implementation and, above all, documentation. Given these facts, I would suggest you be a bit more modest and at least say thank you for the external support.

These kinds of half-baked claims really make me angry!

ByteMe

No, that's definitely not enough! You have a completely different structure:

"/home/vmail/testuser/mail/.foo.bar.baz"

We had /var/vmail/example.com/wh/.INBOX.Fritzbox/

1. The mail directories are located in a completely different place.
2. We have ".INBOX." before the folders everywhere.
3. This isn't about creating new users, but about migrating several hundred gigabytes of emails!

Please read through the migration script; it shows everything we had to do. As I can see on LinkedIn, you're a developer. I'm certainly not going to test that again now; it's definitely too late. And frankly, the explanations are missing again. That would be too much guesswork.

I've finished it and don't want to discuss your Patchwork 2.4 any further. Let everyone else form their own opinions about this kind of developer work.