[BUG] Docker mail server does not start with network_mode:"host"

### Miscellaneous first checks

- [X] I checked that all ports are open and not blocked by my ISP / hosting provider.
- [X] 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.

### Affected Component(s)

Docker Container does not start

### What happened and when does this occur?

```Markdown
Docker is unable to start when i use network_mode: "host"
```


### What did you expect to happen?

```Markdown
i expect the docker to start
```


### How do we replicate the issue?

```Markdown
1.Follow normal steps in documentations
2.add a line -> network_mode: "host" , in Mailserver service
3.docker-compose up
...
```


### DMS version

10.1.2

### How much RAM is available to DMS explicitly?

more than 4GB

### How many CPU cores are available?

more than 4 Cores

### Is DMS running in a virtualized environment?

... a virtual private server (VPS) (with virtual CPU cores)

### What operating system is DMS running on?

Linux

### What instruction set architecture is DMS running on?

x86_64 / AMD64

### I/O - Persistent memory

ext4

### What container orchestration tool are you using?

Docker Compose

### Docker version

_No response_

### Docker Compose version

1.29.2

### The output of `uname -a`

Linux vmi662016.contaboserver.net 4.19.0-17-amd64 #1 SMP Debian 4.19.194-3 (2021-07-18) x86_64 GNU/Linux

### Important environment variables

_No response_

### Relevant log output

```shell
Creating mailserver ... done
Attaching to mailserver
mailserver    | hostname: Name or service not known
mailserver    | hostname: Name or service not known
mailserver    | [ TASKLOG ]  Welcome to docker-mailserver 10.1.2
mailserver    | [[  INF  ]]  ENVIRONMENT
mailserver    | SUPERVISOR_GROUP_NAME=mailserver
mailserver    | POSTGREY_DELAY=300
mailserver    | DEFAULT_RELAY_HOST=
mailserver    | TLS_LEVEL=intermediate
mailserver    | POSTSCREEN_ACTION=enforce
mailserver    | POSTFIX_INET_PROTOCOLS=all
mailserver    | ENABLE_SRS=0
mailserver    | ENABLE_LDAP=0
mailserver    | SPOOF_PROTECTION=0
mailserver    | RELAY_PASSWORD=
mailserver    | ENABLE_MANAGESIEVE=0
mailserver    | ENABLE_POSTGREY=0
mailserver    | SUPERVISOR_SERVER_URL=unix:///dev/shm/supervisor.sock
mailserver    | REPORT_SENDER=
mailserver    | HOSTNAME=
mailserver    | ENABLE_QUOTAS=1
mailserver    | ENABLE_SASLAUTHD=0
mailserver    | AMAVIS_LOGLEVEL=0
mailserver    | NETWORK_INTERFACE=eth0
mailserver    | SASLAUTHD_LDAP_TLS_CACERT_DIR=
mailserver    | DMS_DEBUG=1
mailserver    | SRS_EXCLUDE_DOMAINS=
mailserver    | LDAP_SEARCH_BASE=
mailserver    | SSL_CERT_PATH=
mailserver    | LDAP_QUERY_FILTER_USER=
mailserver    | SASLAUTHD_LDAP_BIND_DN=
mailserver    | RELAY_HOST=
mailserver    | LDAP_QUERY_FILTER_ALIAS=
mailserver    | PWD=/
mailserver    | SA_SPAM_SUBJECT=***SPAM*****
mailserver    | LDAP_SERVER_HOST=
mailserver    | DOVECOT_MAILBOX_FORMAT=maildir
mailserver    | SA_TAG2=6.31
mailserver    | REPORT_INTERVAL=daily
mailserver    | SASL_PASSWD=
mailserver    | POSTFIX_MAILBOX_SIZE_LIMIT=0
mailserver    | SMTP_ONLY=0
mailserver    | ENABLE_POSTFIX_VIRTUAL_TRANSPORT=
mailserver    | SSL_KEY_PATH=
mailserver    | ONE_DIR=1
mailserver    | RELAY_USER=
mailserver    | HOME=/root
mailserver    | SASLAUTHD_LDAP_SERVER=
mailserver    | LDAP_START_TLS=no
mailserver    | SASLAUTHD_LDAP_FILTER=
mailserver    | OVERRIDE_HOSTNAME=
mailserver    | LDAP_BIND_DN=
mailserver    | RELAY_PORT=25
mailserver    | SA_KILL=6.31
mailserver    | SASLAUTHD_LDAP_TLS_CHECK_PEER=
mailserver    | ENABLE_FETCHMAIL=0
mailserver    | FETCHMAIL_POLL=300
mailserver    | ENABLE_AMAVIS=1
mailserver    | SASLAUTHD_LDAP_MECH=
mailserver    | LDAP_BIND_PW=
mailserver    | UPDATE_CHECK_INTERVAL=1d
mailserver    | MOVE_SPAM_TO_JUNK=1
mailserver    | POSTMASTER_ADDRESS=
mailserver    | POSTFIX_MESSAGE_SIZE_LIMIT=10240000
mailserver    | LDAP_QUERY_FILTER_GROUP=
mailserver    | SA_TAG=2.0
mailserver    | DOVECOT_USER_FILTER=
mailserver    | ENABLE_FAIL2BAN=0
mailserver    | SSL_ALT_CERT_PATH=
mailserver    | DOVECOT_AUTH_BIND=
mailserver    | SASLAUTHD_LDAP_START_TLS=
mailserver    | LOGWATCH_INTERVAL=none
mailserver    | POSTGREY_MAX_AGE=35
mailserver    | ENABLE_POP3=0
mailserver    | PFLOGSUMM_SENDER=
mailserver    | LOGWATCH_RECIPIENT=
mailserver    | SASLAUTHD_LDAP_PASSWORD_ATTR=
mailserver    | DOVECOT_TLS=no
mailserver    | POSTGREY_AUTO_WHITELIST_CLIENTS=5
mailserver    | SHLVL=1
mailserver    | PFLOGSUMM_TRIGGER=
mailserver    | POSTGREY_TEXT=Delayed by Postgrey
mailserver    | SRS_SENDER_CLASSES=envelope_sender
mailserver    | FAIL2BAN_BLOCKTYPE=drop
mailserver    | SASLAUTHD_LDAP_AUTH_METHOD=
mailserver    | DOVECOT_PASS_FILTER=
mailserver    | SSL_TYPE=
mailserver    | CHKSUM_FILE=/tmp/docker-mailserver-config-chksum
mailserver    | PERMIT_DOCKER=
mailserver    | SRS_SECRET=
mailserver    | REPORT_RECIPIENT=0
mailserver    | SUPERVISOR_PROCESS_NAME=mailserver
mailserver    | POSTFIX_DAGENT=
mailserver    | VIRUSMAILS_DELETE_DELAY=7
mailserver    | SASLAUTHD_LDAP_SEARCH_BASE=
mailserver    | SASLAUTHD_MECH_OPTIONS=
mailserver    | PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
mailserver    | SUPERVISOR_LOGLEVEL=warn
mailserver    | SASLAUTHD_MECHANISMS=
mailserver    | DOMAINNAME=
mailserver    | ENABLE_SPAMASSASSIN=0
mailserver    | SPAMASSASSIN_SPAM_TO_INBOX=1
mailserver    | SASLAUTHD_LDAP_PASSWORD=
mailserver    | SSL_ALT_KEY_PATH=
mailserver    | ENABLE_CLAMAV=0
mailserver    | SASLAUTHD_LDAP_TLS_CACERT_FILE=
mailserver    | LDAP_QUERY_FILTER_DOMAIN=
mailserver    | PFLOGSUMM_RECIPIENT=
mailserver    | ENABLE_UPDATE_CHECK=1
mailserver    | SUPERVISOR_ENABLED=1
mailserver    | BASH_FUNC__extract_certs_from_acme%%=() {  local KEY;
mailserver    |  KEY=$(cat /etc/letsencrypt/acme.json | python -c "
mailserver    | import sys,json
mailserver    | acme = json.load(sys.stdin)
mailserver    | for key, value in acme.items():
mailserver    |     certs = value['Certificates']
mailserver    |     if certs is not None:
mailserver    |         for cert in certs:
mailserver    |             if 'domain' in cert and 'key' in cert:
mailserver    |                 if 'main' in cert['domain'] and cert['domain']['main'] == '${1}' or 'sans' in cert['domain'] and '${1}' in cert['domain']['sans']:
mailserver    |                     print cert['key']
mailserver    |                     break
mailserver    | ");
mailserver    |  local CERT;
mailserver    |  CERT=$(cat /etc/letsencrypt/acme.json | python -c "
mailserver    | import sys,json
mailserver    | acme = json.load(sys.stdin)
mailserver    | for key, value in acme.items():
mailserver    |     certs = value['Certificates']
mailserver    |     if certs is not None:
mailserver    |         for cert in certs:
mailserver    |             if 'domain' in cert and 'certificate' in cert:
mailserver    |                 if 'main' in cert['domain'] and cert['domain']['main'] == '${1}' or 'sans' in cert['domain'] and '${1}' in cert['domain']['sans']:
mailserver    |                     print cert['certificate']
mailserver    |                     break
mailserver    | ");
mailserver    |  if [[ -n "${KEY}${CERT}" ]]; then
mailserver    |  mkdir -p "/etc/letsencrypt/live/${HOSTNAME}/";
mailserver    |  echo "${KEY}" | base64 -d > /etc/letsencrypt/live/"${HOSTNAME}"/key.pem || exit 1;
mailserver    |  echo "${CERT}" | base64 -d > /etc/letsencrypt/live/"${HOSTNAME}"/fullchain.pem || exit 1;
mailserver    |  _notify 'inf' "Cert found in /etc/letsencrypt/acme.json for ${1}";
mailserver    |  return 0;
mailserver    |  else
mailserver    |  return 1;
mailserver    |  fi
mailserver    | }
mailserver    | BASH_FUNC__monitored_files_checksums%%=() {  ( cd /tmp/docker-mailserver || exit 1;
mailserver    |  exec sha512sum -- postfix-accounts.cf postfix-virtual.cf postfix-aliases.cf dovecot-quotas.cf /etc/letsencrypt/acme.json "/etc/letsencrypt/live/${HOSTNAME}/key.pem" "/etc/letsencrypt/live/${HOSTNAME}/privkey.pem" "/etc/letsencrypt/live/${HOSTNAME}/fullchain.pem" 2> /dev/null )
mailserver    | }
mailserver    | BASH_FUNC__populate_relayhost_map%%=() {  : > /etc/postfix/relayhost_map;
mailserver    |  chown root:root /etc/postfix/relayhost_map;
mailserver    |  chmod 0600 /etc/postfix/relayhost_map;
mailserver    |  if [[ -f /tmp/docker-mailserver/postfix-relaymap.cf ]]; then
mailserver    |  _notify 'inf' "Adding relay mappings from postfix-relaymap.cf";
mailserver    |  sed -n '/^\s*[^#[:space:]]\S*\s\+\S/p' /tmp/docker-mailserver/postfix-relaymap.cf >> /etc/postfix/relayhost_map;
mailserver    |  fi;
mailserver    |  { 
mailserver    |  sed -n '/^\s*[^#[:space:]]/ s/^[^@|]*@$[^|]\+$|.*$/\1/p' /tmp/docker-mailserver/postfix-accounts.cf;
mailserver    |  [ -f /tmp/docker-mailserver/postfix-virtual.cf ] && sed -n '/^\s*[^#[:space:]]/ s/^\s*[^@[:space:]]*@$\S\+$\s.*/\1/p' /tmp/docker-mailserver/postfix-virtual.cf
mailserver    |  } | while read -r DOMAIN; do
mailserver    |  if ! grep -q -e "^@${DOMAIN}\b" /etc/postfix/relayhost_map && ! grep -qs -e "^\s*@${DOMAIN}\s*$" /tmp/docker-mailserver/postfix-relaymap.cf; then
mailserver    |  _notify 'inf' "Adding relay mapping for ${DOMAIN}";
mailserver    |  echo "@${DOMAIN}    [${RELAY_HOST}]:${RELAY_PORT}" >> /etc/postfix/relayhost_map;
mailserver    |  fi;
mailserver    |  done
mailserver    | }
mailserver    | BASH_FUNC__notify%%=() {  { 
mailserver    |  [[ -z ${1:-} ]] || [[ -z ${2:-} ]]
mailserver    |  } && return 0;
mailserver    |  local RESET LGREEN LYELLOW LRED RED LBLUE LGREY LMAGENTA;
mailserver    |  RESET='\e[0m';
mailserver    |  LGREEN='\e[92m';
mailserver    |  LYELLOW='\e[93m';
mailserver    |  LRED='\e[31m';
mailserver    |  RED='\e[91m';
mailserver    |  LBLUE='\e[34m';
mailserver    |  LGREY='\e[37m';
mailserver    |  LMAGENTA='\e[95m';
mailserver    |  case "${1}" in 
mailserver    |  'tasklog')
mailserver    |  echo "-e${3:-}" "[ ${LGREEN}TASKLOG${RESET} ]  ${2}"
mailserver    |  ;;
mailserver    |  'warn')
mailserver    |  echo "-e${3:-}" "[ ${LYELLOW}WARNING${RESET} ]  ${2}"
mailserver    |  ;;
mailserver    |  'err')
mailserver    |  echo "-e${3:-}" "[  ${LRED}ERROR${RESET}  ]  ${2}"
mailserver    |  ;;
mailserver    |  'fatal')
mailserver    |  echo "-e${3:-}" "[  ${RED}FATAL${RESET}  ]  ${2}"
mailserver    |  ;;
mailserver    |  'inf')
mailserver    |  [[ ${DMS_DEBUG} -eq 1 ]] && echo "-e${3:-}" "[[  ${LBLUE}INF${RESET}  ]]  ${2}"
mailserver    |  ;;
mailserver    |  'task')
mailserver    |  [[ ${DMS_DEBUG} -eq 1 ]] && echo "-e${3:-}" "[[ ${LGREY}TASKS${RESET} ]]  ${2}"
mailserver    |  ;;
mailserver    |  *)
mailserver    |  echo "-e${3:-}" "[  ${LMAGENTA}UNKNOWN${RESET}  ]  ${2}"
mailserver    |  ;;
mailserver    |  esac;
mailserver    |  return 0
mailserver    | }
mailserver    | BASH_FUNC__sanitize_ipv4_to_subnet_cidr%%=() {  local DIGIT_PREFIX_LENGTH="${1#*/}";
mailserver    |  declare -a MASKED_DIGITS DIGITS;
mailserver    |  IFS='.';
mailserver    |  read -r -a DIGITS < <(echo "${1%%/*}");
mailserver    |  unset IFS;
mailserver    |  for ((i = 0 ; i < 4 ; i++))
mailserver    |  do
mailserver    |  MASKED_DIGITS[i]=$(_mask_ip_digit "${DIGIT_PREFIX_LENGTH}" "${DIGITS[i]}");
mailserver    |  DIGIT_PREFIX_LENGTH=$((DIGIT_PREFIX_LENGTH - 8));
mailserver    |  done;
mailserver    |  echo "${MASKED_DIGITS[0]}.${MASKED_DIGITS[1]}.${MASKED_DIGITS[2]}.${MASKED_DIGITS[3]}/${1#*/}"
mailserver    | }
mailserver    | _=/usr/bin/printenv
mailserver    | [ TASKLOG ]  Initializing setup
mailserver    | [[ TASKS ]]  Registering functions
mailserver    | [[  INF  ]]  _check_hostname() registered
mailserver    | [[  INF  ]]  _setup_supervisor() registered
mailserver    | [[  INF  ]]  _setup_default_vars() registered
mailserver    | [[  INF  ]]  _setup_file_permissions() registered
mailserver    | [[  INF  ]]  _setup_dovecot() registered
mailserver    | [[  INF  ]]  _setup_dovecot_dhparam() registered
mailserver    | [[  INF  ]]  _setup_dovecot_quota() registered
mailserver    | [[  INF  ]]  _setup_dovecot_local_user() registered
mailserver    | [[  INF  ]]  _setup_dkim() registered
mailserver    | [[  INF  ]]  _setup_ssl() registered
mailserver    | [[  INF  ]]  _setup_docker_permit() registered
mailserver    | [[  INF  ]]  _setup_mailname() registered
mailserver    | [[  INF  ]]  _setup_amavis() registered
mailserver    | [[  INF  ]]  _setup_dmarc_hostname() registered
mailserver    | [[  INF  ]]  _setup_postfix_hostname() registered
mailserver    | [[  INF  ]]  _setup_dovecot_hostname() registered
mailserver    | [[  INF  ]]  _setup_postfix_smtputf8() registered
mailserver    | [[  INF  ]]  _setup_postfix_sasl() registered
mailserver    | [[  INF  ]]  _setup_postfix_sasl_password() registered
mailserver    | [[  INF  ]]  _setup_security_stack() registered
mailserver    | [[  INF  ]]  _setup_postfix_aliases() registered
mailserver    | [[  INF  ]]  _setup_postfix_vhost() registered
mailserver    | [[  INF  ]]  _setup_postfix_dhparam() registered
mailserver    | [[  INF  ]]  _setup_postfix_postscreen() registered
mailserver    | [[  INF  ]]  _setup_postfix_sizelimits() registered
mailserver    | [[  INF  ]]  _setup_postfix_access_control() registered
mailserver    | [[  INF  ]]  _setup_postfix_override_configuration() registered
mailserver    | [[  INF  ]]  _setup_environment() registered
mailserver    | [[  INF  ]]  _setup_logrotate() registered
mailserver    | [[  INF  ]]  _setup_mail_summary() registered
mailserver    | [[  INF  ]]  _setup_logwatch() registered
mailserver    | [[  INF  ]]  _setup_user_patches() registered
mailserver    | [[  INF  ]]  _setup_chksum_file() registered
mailserver    | [[  INF  ]]  _fix_var_mail_permissions() registered
mailserver    | [[  INF  ]]  _fix_var_amavis_permissions() registered
mailserver    | [[  INF  ]]  _fix_cleanup_clamav() registered
mailserver    | [[  INF  ]]  _fix_cleanup_spamassassin() registered
mailserver    | [[  INF  ]]  _misc_save_states() registered
mailserver    | [[  INF  ]]  _start_daemons_cron() registered
mailserver    | [[  INF  ]]  _start_daemons_rsyslog() registered
mailserver    | [[  INF  ]]  _start_daemons_dovecot() registered
mailserver    | [[  INF  ]]  _start_daemons_update_check() registered
mailserver    | [[  INF  ]]  _start_daemons_opendkim() registered
mailserver    | [[  INF  ]]  _start_daemons_opendmarc() registered
mailserver    | [[  INF  ]]  _start_daemons_postfix() registered
mailserver    | [[  INF  ]]  _start_changedetector() registered
mailserver    | [[  INF  ]]  _start_daemons_amavis() registered
mailserver    | [ TASKLOG ]  Checking configuration
mailserver    | [[ TASKS ]]  Checking that hostname/domainname is provided or overridden
mailserver    | [[  INF  ]]  Domain has been set to 
mailserver    | [[  INF  ]]  Hostname has been set to 
mailserver    | [  ERROR  ]  Setting hostname/domainname is required
mailserver    | [  ERROR  ]  Shutting down..
mailserver    | 2021-09-15 06:28:17,487 WARN received SIGTERM indicating exit request
mailserver    | [  FATAL  ]  Please fix your configuration. Exiting...
```


### Other relevant information

```Markdown
docker mailserver works fine as long as i dont add the -> [[ nework_mode: "host" ]] option


my docker-compose file:

version: '3.9'

services:
  mailserver:
    image: docker.io/mailserver/docker-mailserver:latest
    hostname: sales
    domainname: medpricemarketing.com
    container_name: mailserver
    env_file: mailserver.env

#    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)

    volumes:
      - ./data/maildata:/var/mail
      - ./data/mailstate:/var/mail-state
      - ./data/maillogs:/var/log/mail
      - /etc/localtime:/etc/localtime:ro
      - ./config/:/tmp/docker-mailserver/

    network_mode: "host"
    restart: always
    stop_grace_period: 1m
    cap_add: [ "NET_ADMIN", "SYS_PTRACE" ]


if i uncomment ports and comment the network, it will start working with 0 errors
```


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

I'm comfortable with Docker / containers, but I'm relatively new to all this mail stuff

### Code of conduct

- [X] I have read this project's [Code of Conduct](https://github.com/docker-mailserver/docker-mailserver/blob/master/CODE_OF_CONDUCT.md) and I agree
- [X] I have read the [README](https://github.com/docker-mailserver/docker-mailserver/blob/master/README.md) and the [documentation](https://docker-mailserver.github.io/docker-mailserver/edge/) and I searched the [issue tracker](https://github.com/docker-mailserver/docker-mailserver/issues?q=is%3Aissue) but could not find a solution

### Improvements to this form?

_No response_

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

[BUG] Docker mail server does not start with network_mode:"host" #2195

Miscellaneous first checks

Affected Component(s)

What happened and when does this occur?

What did you expect to happen?

How do we replicate the issue?

DMS version

How much RAM is available to DMS explicitly?

How many CPU cores are available?

Is DMS running in a virtualized environment?

What operating system is DMS running on?

What instruction set architecture is DMS running on?

I/O - Persistent memory

What container orchestration tool are you using?

Docker version

Docker Compose version

The output of `uname -a`

Important environment variables

Relevant log output

Other relevant information

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

Code of conduct

Improvements to this form?

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Uh oh!

[BUG] Docker mail server does not start with network_mode:"host" #2195

Description

Miscellaneous first checks

Affected Component(s)

What happened and when does this occur?

What did you expect to happen?

How do we replicate the issue?

DMS version

How much RAM is available to DMS explicitly?

How many CPU cores are available?

Is DMS running in a virtualized environment?

What operating system is DMS running on?

What instruction set architecture is DMS running on?

I/O - Persistent memory

What container orchestration tool are you using?

Docker version

Docker Compose version

The output of uname -a

Important environment variables

Relevant log output

Other relevant information

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

Code of conduct

Improvements to this form?

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions

The output of `uname -a`