As per deprecation notice from v11.3 release notes, and a related prior PR; this ENV is to be removed. It's no longer considered useful, and none of the tests that configured it were actually using it for relaying anything.
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Environment Variables |
!!! info
Values in **bold** are the default values. If an option doesn't work as documented here, check if you are running the latest image. The current `master` branch corresponds to the image `mailserver/docker-mailserver:edge`.
General
OVERRIDE_HOSTNAME
- empty => uses the
hostname
command to get canonical hostname fordocker-mailserver
to use. - => Specify a fully-qualified domainname to serve mail for. This is used for many of the config features so if you can't set your hostname (eg: you're in a container platform that doesn't let you) specify it via this environment variable. It will take priority over
docker run
options:--hostname
and--domainname
, ordocker-compose.yml
config equivalents:hostname:
anddomainname:
.
DMS_DEBUG
This environment variable was removed in v11.0.0
! Use LOG_LEVEL
instead.
LOG_LEVEL
Set the log level for DMS. This is mostly relevant for container startup scripts and change detection event feedback.
Valid values (in order of increasing verbosity) are: error
, warn
, info
, debug
and trace
. The default log level is info
.
SUPERVISOR_LOGLEVEL
Here you can adjust the log-level for Supervisor. Possible values are
- critical => Only show critical messages
- error => Only show erroneous output
- warn => Show warnings
- info => Normal informational output
- debug => Also show debug messages
The log-level will show everything in its class and above.
ONE_DIR
- 0 => state in default directories.
- 1 => consolidate all states into a single directory (
/var/mail-state
) to allow persistence using docker volumes. See the related FAQ entry for more information.
ACCOUNT_PROVISIONER
Configures the provisioning source of user accounts (including aliases) for user queries and authentication by services managed by DMS (Postfix and Dovecot).
User provisioning via OIDC is planned for the future, see this tracking issue.
- empty => use FILE
- LDAP => use LDAP authentication
- OIDC => use OIDC authentication (not yet implemented)
- FILE => use local files (this is used as the default)
PERMIT_DOCKER
Set different options for mynetworks option (can be overwrite in postfix-main.cf) WARNING: Adding the docker network's gateway to the list of trusted hosts, e.g. using the network
or connected-networks
option, can create an open relay, for instance if IPv6 is enabled on the host machine but not in Docker.
- none => Explicitly force authentication
- container => Container IP address only.
- host => Add docker host (ipv4 only).
- network => Add the docker default bridge network (172.16.0.0/12); WARNING:
docker-compose
might use others (e.g. 192.168.0.0/16) usePERMIT_DOCKER=connected-networks
in this case. - connected-networks => Add all connected docker networks (ipv4 only).
Note: you probably want to set POSTFIX_INET_PROTOCOLS=ipv4
to make it work fine with Docker.
TZ
Set the timezone. If this variable is unset, the container runtime will try to detect the time using /etc/localtime
, which you can alternatively mount into the container. The value of this variable must follow the pattern AREA/ZONE
, i.e. of you want to use Germany's time zone, use Europe/Berlin
. You can lookup all available timezones here.
ENABLE_AMAVIS
Amavis content filter (used for ClamAV & SpamAssassin)
- 0 => Amavis is disabled
- 1 => Amavis is enabled
AMAVIS_LOGLEVEL
This page provides information on Amavis' logging statistics.
- -1/-2/-3 => Only show errors
- 0 => Show warnings
- 1/2 => Show default informational output
- 3/4/5 => log debug information (very verbose)
ENABLE_DNSBL
This enables the zen.spamhaus.org DNS block list in postfix and various lists in postscreen.
Note: Emails will be rejected, if they don't pass the block list checks!
- 0 => DNS block lists are disabled
- 1 => DNS block lists are enabled
ENABLE_CLAMAV
- 0 => ClamAV is disabled
- 1 => ClamAV is enabled
ENABLE_POP3
- empty => POP3 service disabled
- 1 => Enables POP3 service
ENABLE_FAIL2BAN
- 0 => fail2ban service disabled
- 1 => Enables fail2ban service
If you enable Fail2Ban, don't forget to add the following lines to your docker-compose.yml
:
cap_add:
- NET_ADMIN
Otherwise, nftables
won't be able to ban IPs.
FAIL2BAN_BLOCKTYPE
- drop => drop packet (send NO reply)
- reject => reject packet (send ICMP unreachable) FAIL2BAN_BLOCKTYPE=drop
SMTP_ONLY
- empty => all daemons start
- 1 => only launch postfix smtp
SSL_TYPE
In the majority of cases, you want letsencrypt
or manual
.
self-signed
can be used for testing SSL until you provide a valid certificate, note that third-parties cannot trust self-signed
certificates, do not use this type in production. custom
is a temporary workaround that is not officially supported.
- empty => SSL disabled.
- letsencrypt => Support for using certificates with Let's Encrypt provisioners. (Docs: Let's Encrypt Setup)
- manual => Provide your own certificate via separate key and cert files. (Docs: Bring Your Own Certificates)
- Requires:
SSL_CERT_PATH
andSSL_KEY_PATH
ENV vars to be set to the location of the files within the container. - Optional:
SSL_ALT_CERT_PATH
andSSL_ALT_KEY_PATH
allow providing a 2nd certificate as a fallback for dual (aka hybrid) certificate support. Useful for ECDSA with an RSA fallback. Presently onlymanual
mode supports this feature.
- Requires:
- custom => Provide your own certificate as a single file containing both the private key and full certificate chain. (Docs:
None
) - self-signed => Provide your own self-signed certificate files. Expects a self-signed CA cert for verification. Use only for local testing of your setup. (Docs: Self-Signed Certificates)
Please read the SSL page in the documentation for more information.
TLS_LEVEL
- empty => modern
- modern => Enables TLSv1.2 and modern ciphers only. (default)
- intermediate => Enables TLSv1, TLSv1.1 and TLSv1.2 and broad compatibility ciphers.
SPOOF_PROTECTION
Configures the handling of creating mails with forged sender addresses.
- empty => Mail address spoofing allowed. Any logged in user may create email messages with a forged sender address. See also Wikipedia(not recommended, but default for backwards compatibility reasons)
- 1 => (recommended) Mail spoofing denied. Each user may only send with his own or his alias addresses. Addresses with extension delimiters are not able to send messages.
ENABLE_SRS
Enables the Sender Rewriting Scheme. SRS is needed if docker-mailserver
acts as forwarder. See postsrsd for further explanation.
- 0 => Disabled
- 1 => Enabled
NETWORK_INTERFACE
In case your network interface differs from eth0
, e.g. when you are using HostNetworking in Kubernetes, you can set this to whatever interface you want. This interface will then be used.
- empty =>
eth0
VIRUSMAILS_DELETE_DELAY
Set how many days a virusmail will stay on the server before being deleted
- empty => 7 days
ENABLE_POSTFIX_VIRTUAL_TRANSPORT
This Option is activating the Usage of POSTFIX_DAGENT to specify a ltmp client different from default dovecot socket.
- empty => disabled
- 1 => enabled
POSTFIX_DAGENT
Enabled by ENABLE_POSTFIX_VIRTUAL_TRANSPORT. Specify the final delivery of postfix
- empty: fail
lmtp:unix:private/dovecot-lmtp
(use socket)lmtps:inet:<host>:<port>
(secure lmtp with starttls, take a look at https://sys4.de/en/blog/2014/11/17/sicheres-lmtp-mit-starttls-in-dovecot/)lmtp:<kopano-host>:2003
(use kopano as mailstore)- etc.
POSTFIX_MAILBOX_SIZE_LIMIT
Set the mailbox size limit for all users. If set to zero, the size will be unlimited (default).
- empty => 0 (no limit)
ENABLE_QUOTAS
- 1 => Dovecot quota is enabled
- 0 => Dovecot quota is disabled
See mailbox quota.
POSTFIX_MESSAGE_SIZE_LIMIT
Set the message size limit for all users. If set to zero, the size will be unlimited (not recommended!)
- empty => 10240000 (~10 MB)
CLAMAV_MESSAGE_SIZE_LIMIT
Mails larger than this limit won't be scanned. ClamAV must be enabled (ENABLE_CLAMAV=1) for this.
- empty => 25M (25 MB)
ENABLE_MANAGESIEVE
- empty => Managesieve service disabled
- 1 => Enables Managesieve on port 4190
POSTMASTER_ADDRESS
- empty => postmaster@example.com
- => Specify the postmaster address
ENABLE_UPDATE_CHECK
Check for updates on container start and then once a day. If an update is available, a mail is send to POSTMASTER_ADDRESS.
- 0 => Update check disabled
- 1 => Update check enabled
UPDATE_CHECK_INTERVAL
Customize the update check interval. Number + Suffix. Suffix must be 's' for seconds, 'm' for minutes, 'h' for hours or 'd' for days.
- 1d => Check for updates once a day
POSTSCREEN_ACTION
- enforce => Allow other tests to complete. Reject attempts to deliver mail with a 550 SMTP reply, and log the helo/sender/recipient information. Repeat this test the next time the client connects.
- drop => Drop the connection immediately with a 521 SMTP reply. Repeat this test the next time the client connects.
- ignore => Ignore the failure of this test. Allow other tests to complete. Repeat this test the next time the client connects. This option is useful for testing and collecting statistics without blocking mail.
DOVECOT_MAILBOX_FORMAT
- maildir => uses very common Maildir format, one file contains one message
- sdbox => (experimental) uses Dovecot high-performance mailbox format, one file contains one message
- mdbox ==> (experimental) uses Dovecot high-performance mailbox format, multiple messages per file and multiple files per box
This option has been added in November 2019. Using other format than Maildir is considered as experimental in docker-mailserver and should only be used for testing purpose. For more details, please refer to Dovecot Documentation.
POSTFIX_INET_PROTOCOLS
- all => Listen on all interfaces.
- ipv4 => Listen only on IPv4 interfaces. Most likely you want this behind Docker.
- ipv6 => Listen only on IPv6 interfaces.
Note: More details at http://www.postfix.org/postconf.5.html#inet_protocols
DOVECOT_INET_PROTOCOLS
- all => Listen on all interfaces
- ipv4 => Listen only on IPv4 interfaces. Most likely you want this behind Docker.
- ipv6 => Listen only on IPv6 interfaces.
Note: More information at https://dovecot.org/doc/dovecot-example.conf
Reports
PFLOGSUMM_TRIGGER
Enables regular Postfix log summary ("pflogsumm") mail reports.
- not set => No report
- daily_cron => Daily report for the previous day
- logrotate => Full report based on the mail log when it is rotated
This is a new option. The old REPORT options are still supported for backwards compatibility. If this is not set and reports are enabled with the old options, logrotate will be used.
PFLOGSUMM_RECIPIENT
Recipient address for Postfix log summary reports.
- not set => Use POSTMASTER_ADDRESS
- => Specify the recipient address(es)
PFLOGSUMM_SENDER
Sender address (FROM
) for pflogsumm reports (if Postfix log summary reports are enabled).
- not set => Use REPORT_SENDER
- => Specify the sender address
LOGWATCH_INTERVAL
Interval for logwatch report.
- none => No report is generated
- daily => Send a daily report
- weekly => Send a report every week
LOGWATCH_RECIPIENT
Recipient address for logwatch reports if they are enabled.
- not set => Use REPORT_RECIPIENT or POSTMASTER_ADDRESS
- => Specify the recipient address(es)
LOGWATCH_SENDER
Sender address (FROM
) for logwatch reports if logwatch reports are enabled.
- not set => Use REPORT_SENDER
- => Specify the sender address
REPORT_RECIPIENT
Defines who receives reports (if they are enabled).
- empty => Use POSTMASTER_ADDRESS
- => Specify the recipient address
REPORT_SENDER
Defines who sends reports (if they are enabled).
- empty =>
mailserver-report@<YOUR DOMAIN>
- => Specify the sender address
LOGROTATE_INTERVAL
Changes the interval in which log files are rotated.
- weekly => Rotate log files weekly
- daily => Rotate log files daily
- monthly => Rotate log files monthly
!!! note
`LOGROTATE_INTERVAL` only manages `logrotate` within the container for services we manage internally.
The entire log output for the container is still available via `docker logs mailserver` (or your respective container name). If you want to configure external log rotation for that container output as well, : [Docker Logging Drivers](https://docs.docker.com/config/containers/logging/configure/).
By default, the logs are lost when the container is destroyed (eg: re-creating via `docker-compose down && docker-compose up -d`). To keep the logs, mount a volume (to `/var/log/mail/`).
!!! note
This variable can also determine the interval for Postfix's log summary reports, see [`PFLOGSUMM_TRIGGER`](#pflogsumm_trigger).
SpamAssassin
ENABLE_SPAMASSASSIN
- 0 => SpamAssassin is disabled
- 1 => SpamAssassin is enabled
SPAMASSASSIN_SPAM_TO_INBOX
- 0 => Spam messages will be bounced (rejected) without any notification (dangerous).
- 1 => Spam messages will be delivered to the inbox and tagged as spam using
SA_SPAM_SUBJECT
.
ENABLE_SPAMASSASSIN_KAM
KAM is a 3rd party SpamAssassin ruleset, provided by the McGrail Foundation. If SpamAssassin is enabled, KAM can be used in addition to the default ruleset.
- 0 => KAM disabled
- 1 => KAM enabled
MOVE_SPAM_TO_JUNK
Spam messages can be moved in the Junk folder.
Note: this setting needs SPAMASSASSIN_SPAM_TO_INBOX=1
- 0 => Spam messages will be delivered in the mailbox.
- 1 => Spam messages will be delivered in the
Junk
folder.
SA_TAG
- 2.0 => add spam info headers if at, or above that level
Note: this SpamAssassin setting needs ENABLE_SPAMASSASSIN=1
SA_TAG2
- 6.31 => add 'spam detected' headers at that level
Note: this SpamAssassin setting needs ENABLE_SPAMASSASSIN=1
SA_KILL
- 6.31 => triggers spam evasive actions
!!! note "This SpamAssassin setting needs ENABLE_SPAMASSASSIN=1
"
By default, `docker-mailserver` is configured to quarantine spam emails.
If emails are quarantined, they are compressed and stored in a location dependent on the `ONE_DIR` setting above. To inhibit this behaviour and deliver spam emails, set this to a very high value e.g. `100.0`.
If `ONE_DIR=1` (default) the location is `/var/mail-state/lib-amavis/virusmails/`, or if `ONE_DIR=0`: `/var/lib/amavis/virusmails/`. These paths are inside the docker container.
SA_SPAM_SUBJECT
- ***SPAM*** => add tag to subject if spam detected
Note: this SpamAssassin setting needs ENABLE_SPAMASSASSIN=1
. Add the SpamAssassin score to the subject line by inserting the keyword _SCORE_: ***SPAM(_SCORE_)***.
SA_SHORTCIRCUIT_BAYES_SPAM
- 1 => will activate SpamAssassin short circuiting for bayes spam detection.
This will uncomment the respective line in /etc/spamassasin/local.cf
Note: activate this only if you are confident in your bayes database for identifying spam.
SA_SHORTCIRCUIT_BAYES_HAM
- 1 => will activate SpamAssassin short circuiting for bayes ham detection
This will uncomment the respective line in /etc/spamassasin/local.cf
Note: activate this only if you are confident in your bayes database for identifying ham.
Fetchmail
ENABLE_FETCHMAIL
- 0 =>
fetchmail
disabled - 1 =>
fetchmail
enabled
FETCHMAIL_POLL
- 300 =>
fetchmail
The number of seconds for the interval
FETCHMAIL_PARALLEL
0 => fetchmail
runs with a single config file /etc/fetchmailrc
1 => /etc/fetchmailrc
is split per poll entry. For every poll entry a separate fetchmail instance is started to allow having multiple imap idle configurations defined.
Note: The defaults of your fetchmailrc file need to be at the top of the file. Otherwise it won't be added correctly to all separate fetchmail
instances.
LDAP
ENABLE_LDAP
Deprecated. See ACCOUNT_PROVISIONER
.
LDAP_START_TLS
- empty => no
- yes => LDAP over TLS enabled for Postfix
LDAP_SERVER_HOST
- empty => mail.example.com
- => Specify the dns-name/ip-address where the ldap-server is listening, or an URI like
ldaps://mail.example.com
- NOTE: If you going to use
docker-mailserver
in combination withdocker-compose.yml
you can set the service name here
LDAP_SEARCH_BASE
- empty => ou=people,dc=domain,dc=com
- => e.g. LDAP_SEARCH_BASE=dc=mydomain,dc=local
LDAP_BIND_DN
- empty => cn=admin,dc=domain,dc=com
- => take a look at examples of SASL_LDAP_BIND_DN
LDAP_BIND_PW
- empty => admin
- => Specify the password to bind against ldap
LDAP_QUERY_FILTER_USER
- e.g.
(&(mail=%s)(mailEnabled=TRUE))
- => Specify how ldap should be asked for users
LDAP_QUERY_FILTER_GROUP
- e.g.
(&(mailGroupMember=%s)(mailEnabled=TRUE))
- => Specify how ldap should be asked for groups
LDAP_QUERY_FILTER_ALIAS
- e.g.
(&(mailAlias=%s)(mailEnabled=TRUE))
- => Specify how ldap should be asked for aliases
LDAP_QUERY_FILTER_DOMAIN
- e.g.
(&(|(mail=*@%s)(mailalias=*@%s)(mailGroupMember=*@%s))(mailEnabled=TRUE))
- => Specify how ldap should be asked for domains
LDAP_QUERY_FILTER_SENDERS
- empty => use user/alias/group maps directly, equivalent to
(|($LDAP_QUERY_FILTER_USER)($LDAP_QUERY_FILTER_ALIAS)($LDAP_QUERY_FILTER_GROUP))
- => Override how ldap should be asked if a sender address is allowed for a user
DOVECOT_TLS
- empty => no
- yes => LDAP over TLS enabled for Dovecot
Dovecot
The following variables overwrite the default values for /etc/dovecot/dovecot-ldap.conf.ext
.
DOVECOT_BASE
- empty => same as
LDAP_SEARCH_BASE
- => Tell Dovecot to search only below this base entry. (e.g.
ou=people,dc=domain,dc=com
)
DOVECOT_DEFAULT_PASS_SCHEME
- empty =>
SSHA
- => Select one crypt scheme for password hashing from this list of password schemes.
DOVECOT_DN
- empty => same as
LDAP_BIND_DN
- => Bind dn for LDAP connection. (e.g.
cn=admin,dc=domain,dc=com
)
DOVECOT_DNPASS
- empty => same as
LDAP_BIND_PW
- => Password for LDAP dn sepecifified in
DOVECOT_DN
.
DOVECOT_URIS
- empty => same as
LDAP_SERVER_HOST
- => Specify a space separated list of LDAP uris.
- Note: If the protocol is missing,
ldap://
will be used. - Note: This deprecates
DOVECOT_HOSTS
(as it didn't allow to use LDAPS), which is currently still supported for backwards compatibility.
DOVECOT_LDAP_VERSION
- empty => 3
- 2 => LDAP version 2 is used
- 3 => LDAP version 3 is used
DOVECOT_AUTH_BIND
- empty => no
- yes => Enable LDAP authentication binds
DOVECOT_USER_FILTER
- e.g.
(&(objectClass=PostfixBookMailAccount)(uniqueIdentifier=%n))
DOVECOT_USER_ATTRS
- e.g.
homeDirectory=home,qmailUID=uid,qmailGID=gid,mailMessageStore=mail
- => Specify the directory to dovecot attribute mapping that fits your directory structure.
- Note: This is necessary for directories that do not use the Postfix Book Schema.
- Note: The left-hand value is the directory attribute, the right hand value is the dovecot variable.
- More details on the Dovecot Wiki
DOVECOT_PASS_FILTER
- e.g.
(&(objectClass=PostfixBookMailAccount)(uniqueIdentifier=%n))
- empty => same as
DOVECOT_USER_FILTER
DOVECOT_PASS_ATTRS
- e.g.
uid=user,userPassword=password
- => Specify the directory to dovecot variable mapping that fits your directory structure.
- Note: This is necessary for directories that do not use the Postfix Book Schema.
- Note: The left-hand value is the directory attribute, the right hand value is the dovecot variable.
- More details on the Dovecot Wiki
Postgrey
ENABLE_POSTGREY
- 0 =>
postgrey
is disabled - 1 =>
postgrey
is enabled
POSTGREY_DELAY
- 300 => greylist for N seconds
Note: This postgrey setting needs ENABLE_POSTGREY=1
POSTGREY_MAX_AGE
- 35 => delete entries older than N days since the last time that they have been seen
Note: This postgrey setting needs ENABLE_POSTGREY=1
POSTGREY_AUTO_WHITELIST_CLIENTS
- 5 => whitelist host after N successful deliveries (N=0 to disable whitelisting)
Note: This postgrey setting needs ENABLE_POSTGREY=1
POSTGREY_TEXT
- Delayed by Postgrey => response when a mail is greylisted
Note: This postgrey setting needs ENABLE_POSTGREY=1
SASL Auth
ENABLE_SASLAUTHD
- 0 =>
saslauthd
is disabled - 1 =>
saslauthd
is enabled
SASLAUTHD_MECHANISMS
- empty => pam
ldap
=> authenticate against ldap servershadow
=> authenticate against local user dbmysql
=> authenticate against mysql dbrimap
=> authenticate against imap server- NOTE: can be a list of mechanisms like pam ldap shadow
SASLAUTHD_MECH_OPTIONS
- empty => None
- e.g. with SASLAUTHD_MECHANISMS rimap you need to specify the ip-address/servername of the imap server ==> xxx.xxx.xxx.xxx
SASLAUTHD_LDAP_SERVER
- empty => same as
LDAP_SERVER_HOST
- Note: since version 10.0.0, you can specify a protocol here (like ldaps://); this deprecates SASLAUTHD_LDAP_SSL.
SASLAUTHD_LDAP_START_TLS
- empty =>
no
yes
=> Enableldap_start_tls
option
SASLAUTHD_LDAP_TLS_CHECK_PEER
- empty =>
no
yes
=> Enableldap_tls_check_peer
option
SASLAUTHD_LDAP_TLS_CACERT_DIR
Path to directory with CA (Certificate Authority) certificates.
- empty => Nothing is added to the configuration
- Any value => Fills the
ldap_tls_cacert_dir
option
SASLAUTHD_LDAP_TLS_CACERT_FILE
File containing CA (Certificate Authority) certificate(s).
- empty => Nothing is added to the configuration
- Any value => Fills the
ldap_tls_cacert_file
option
SASLAUTHD_LDAP_BIND_DN
- empty => same as
LDAP_BIND_DN
- specify an object with privileges to search the directory tree
- e.g. active directory: SASLAUTHD_LDAP_BIND_DN=cn=Administrator,cn=Users,dc=mydomain,dc=net
- e.g. openldap: SASLAUTHD_LDAP_BIND_DN=cn=admin,dc=mydomain,dc=net
SASLAUTHD_LDAP_PASSWORD
- empty => same as
LDAP_BIND_PW
SASLAUTHD_LDAP_SEARCH_BASE
- empty => same as
LDAP_SEARCH_BASE
- specify the search base
SASLAUTHD_LDAP_FILTER
- empty => default filter
(&(uniqueIdentifier=%u)(mailEnabled=TRUE))
- e.g. for active directory:
(&(sAMAccountName=%U)(objectClass=person))
- e.g. for openldap:
(&(uid=%U)(objectClass=person))
SASLAUTHD_LDAP_PASSWORD_ATTR
Specify what password attribute to use for password verification.
- empty => Nothing is added to the configuration but the documentation says it is
userPassword
by default. - Any value => Fills the
ldap_password_attr
option
SASLAUTHD_LDAP_AUTH_METHOD
- empty =>
bind
will be used as a default value fastbind
=> The fastbind method is usedcustom
=> The custom method uses userPassword attribute to verify the password
SASLAUTHD_LDAP_MECH
Specify the authentication mechanism for SASL bind.
- empty => Nothing is added to the configuration
- Any value => Fills the
ldap_mech
option
SRS (Sender Rewriting Scheme)
SRS_SENDER_CLASSES
An email has an "envelope" sender (indicating the sending server) and a "header" sender (indicating who sent it). More strict SPF policies may require you to replace both instead of just the envelope sender.
- envelope_sender => Rewrite only envelope sender address
- header_sender => Rewrite only header sender (not recommended)
- envelope_sender,header_sender => Rewrite both senders
SRS_EXCLUDE_DOMAINS
- empty => Envelope sender will be rewritten for all domains
- provide comma separated list of domains to exclude from rewriting
SRS_SECRET
- empty => generated when the container is started for the first time
- provide a secret to use in base64
- you may specify multiple keys, comma separated. the first one is used for signing and the remaining will be used for verification. this is how you rotate and expire keys
- if you have a cluster/swarm make sure the same keys are on all nodes
- example command to generate a key:
dd if=/dev/urandom bs=24 count=1 2>/dev/null | base64
SRS_DOMAINNAME
- empty => Derived from
OVERRIDE_HOSTNAME
,$DOMAINNAME
(internal), or the container's hostname - Set this if auto-detection fails, isn't what you want, or you wish to have a separate container handle DSNs
Default Relay Host
DEFAULT_RELAY_HOST
- empty => don't set default relayhost setting in main.cf
- default host and port to relay all mail through.
Format:
[example.com]:587
(don't forget the brackets if you need this to be compatible with$RELAY_USER
and$RELAY_PASSWORD
, explained below).
Multi-domain Relay Hosts
RELAY_HOST
- empty => don't configure relay host
- default host to relay mail through
RELAY_PORT
- empty => 25
- default port to relay mail through
RELAY_USER
- empty => no default
- default relay username (if no specific entry exists in postfix-sasl-password.cf)
RELAY_PASSWORD
- empty => no default
- password for default relay user