docker-mailserver: [BUG]: Dovecot mail-dir and home locations shouldn't overlap

Preliminary Checks

• I checked that all ports are open and not blocked by my ISP / hosting provider.
• I know that SSL errors are likely the result of a wrong setup on the user side and not caused by DMS itself. I’m confident my setup is correct.
• I searched the issue tracker but was unable to find my issue.
• I read the extended documentation in general but found nothing to resolve the issue.
• I read the documentation on debugging, tried the proposed steps to debug the problem, but was still unable to resolve the issue.
• I have read this project’s Code of Conduct and I agree

Affected Component(s)

Dovecot errors when creating a filter rule to forward an email

What happened and when does this occur?

Logwatch reports the following (sanitized) error:

imap(<EMAIL_ADDRESS>)<1492788><5ivHyk/6QQSsOq3S>: Error: stat(/var/mail/<DOMAIN>/<USER>/.dovecot.lda-dupes/tmp) failed: Not a directory: 2 Time(s)

What did you expect to happen?

Clean log files in logwatch

How do we replicate the issue?

1.Using Roundcube I created a rule to forward specific emails from one local mail user to another mail user (error seems to have started when I did this) 2. This creates a file named .dovecot.lda-dupes in the users maildir folder 3. Dovecot appears to think this is an email folder because of it’s location and because it starts with a dot …

DMS version

v12.0

What operating system is DMS running on?

Linux

Which operating system version?

debian 11

What instruction set architecture is DMS running on?

AMD64 / x86_64

What container orchestration tool are you using?

Docker

docker-compose.yml

services:
  mailserver:
    image: docker.io/mailserver/docker-mailserver:latest
    container_name: mailserver
    # If the FQDN for your mail-server is only two labels (eg: example.com),
    # you can assign this entirely to `hostname` and remove `domainname`.
    hostname: mail
    domainname: edmunds.email
    env_file: mailserver.env
    #dns:
    #  - 127.0.0.1
    # More information about the mail-server ports:
    # https://docker-mailserver.github.io/docker-mailserver/edge/config/security/understanding-the-ports/
    # To avoid conflicts with yaml base-60 float, DO NOT remove the quotation marks.
    ports:
      - "25:25"    # SMTP  (explicit TLS => STARTTLS)
      - "143:143"  # IMAP4 (explicit TLS => STARTTLS)
      - "465:465"  # ESMTP (implicit TLS)
      - "587:587"  # ESMTP (explicit TLS => STARTTLS)
      - "993:993"  # IMAP4 (implicit TLS)
      - "4190:4190"    # Manage sieve
      - "10110:10110"  # POP3 (explicit TLS with HAProxy)
      - "10123:10123"  # Dovecot auth port for radicale
      - "10143:10143"  # IMAP4 (explicit TLS with HAProxy)
      - "10993:10993"  # IMAP4 (implicit TLS with HAProxy)
      - "10995:10995"  # POP3S (implicit TLS with HAProxy)
      - "11334:11334"  # Rspamd web interface
      - "14190:14190"  # Manage sieve
    volumes:
      - ./docker-data/dms/mail-data/:/var/mail/
      - ./docker-data/dms/mail-state/:/var/mail-state/
      - ./docker-data/dms/mail-logs/:/var/log/mail/
      - ./docker-data/dms/config/:/tmp/docker-mailserver/
      - /etc/localtime:/etc/localtime:ro
      - ./docker-data/dms/certs/:/tmp/dms/certs/:ro
      # ./docker-data/dms/cron/sa-learn:/etc/cron.d/sa-learn
      - ./docker-data/dms/config/dovecot/10-custom.conf:/etc/dovecot/conf.d/10-custom.conf
      - ./docker-data/dms/config/rspamd/:/etc/rspamd/override.d/
    restart: unless-stopped
    stop_grace_period: 1m
    cap_add:
      - NET_ADMIN
    healthcheck:
      test: "ss --listening --tcp | grep -P 'LISTEN.+:smtp' || exit 1"
      timeout: 3s
      retries: 0

Relevant log output

imap([<EMAIL_ADDRESS>](mailto:<EMAIL_ADDRESS>))<1492788><5ivHyk/6QQSsOq3S>: Error: stat(/var/mail/<DOMAIN>/<USER>/.dovecot.lda-dupes/tmp) failed: Not a directory: 2 Time(s)

Other relevant information

According to this post the location of this file is an issue: https://dovecot.dovecot.narkive.com/BRuWMv1g/problem-with-lda-dupes-file

Because it starts with a dot and is located where your Maildir-root
directory is and the IMAP demon tries to access a mailbox called
"dovecot.lda-dupes".

You should not (must not) have home == maildir root.

What level of experience do you have with Docker and mail servers?

• I am inexperienced with docker
• I am rather experienced with docker
• I am inexperienced with mail servers
• I am rather experienced with mail servers
• I am uncomfortable with the CLI
• I am rather comfortable with the CLI

Improvements to this form?

No response