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Mailu configuration settings
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============================
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Common configuration
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--------------------
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The ``SECRET_KEY`` **must** be changed for every setup and set to a 16 bytes
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randomly generated value. It is intended to secure authentication cookies
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among other critical uses.
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The ``DOMAIN`` holds the main e-mail domain for the server. This email domain
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is used for bounce emails, for generating the postmaster email and other
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technical addresses.
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The ``HOSTNAMES`` are all public hostnames for the mail server. Mailu supports
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a mail server with multiple hostnames. The first declared hostname is the main
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hostname and will be exposed over SMTP, IMAP, etc.
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The ``POSTMASTER`` is the local part of the postmaster email address. It is
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recommended to setup a generic value and later configure a mail alias for that
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address.
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The ``AUTH_RATELIMIT`` holds a security setting for fighting attackers that
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try to guess user passwords. The value is the limit of requests that a single
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IP address can perform against IMAP, POP and SMTP authentication endpoints.
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Mail settings
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-------------
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The ``MESSAGE_SIZE_LIMIT`` is the maximum size of a single email. It should not
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be too low to avoid dropping legitimate emails and should not be too high to
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avoid filling the disks with large junk emails.
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The ``RELAYNETS`` are network addresses for which mail is relayed for free with
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no authentication required. This should be used with great care. It is
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recommended to include your Docker internal network addresses if other Docker
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containers use Mailu as their mail relay.
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The ``RELAYHOST`` is an optional address of a mail server relaying all outgoing
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mail.
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The ``FETCHMAIL_DELAY`` is a delay (in seconds) for the fetchmail service to
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go and fetch new email if available. Do not use too short delays if you do not
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want to be blacklisted by external services, but not too long delays if you
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want to receive your email in time.
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The ``RECIPIENT_DELIMITED`` is a character used to delimit localpart from a
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custom address part. For instance, if set to ``+``, users can use addresses
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like ``localpart+custom@domain.tld`` to deliver mail to ``localpart@domain.tld``.
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This is useful to provide external parties with different email addresses and
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later classify incoming mail based on the custom part.
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The ``DMAR_RUA`` and ``DMARC_RUF`` are DMARC protocol specific values. They hold
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the localpart for DMARC rua and ruf email addresses.
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Web settings
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------------
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The ``WEB_ADMIN`` contains the path to the main admin interface, while
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``WEB_WEBMAIL`` contains the path to the Web email client.
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Both ``SITENAME`` and ``WEBSITE`` are customization options for the panel menu
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in the admin interface, while ``SITENAME`` is a customization option for
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every Web interface.
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Advanced settings
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-----------------
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The ``PASSWORD_SCHEME`` is the password encryption scheme. You should use the
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default value, unless you are importing password from a separate system and
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want to keep using the old password encryption scheme.
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Infrastructure settings
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-----------------------
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Various environment variables ``HOST_*`` can be used to run Mailu containers
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separately from a supported orchestrator. It is used by the various components
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to find the location of the other containers it depends on. They can contain an
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optional port number. Those variables are:
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- ``HOST_IMAP``: the container that is running the IMAP server (default: ``imap``, port 143)
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- ``HOST_POP3``: the container that is running the POP3 server (default: ``imap``, port 110)
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- ``HOST_SMTP``: the container that is running the SMTP server (default: ``smtp``, port 25)
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- ``HOST_AUTHSMTP``: the container that is running the authenticated SMTP server for the webnmail (default: ``smtp``, port 10025)
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- ``HOST_ADMIN``: the container that is running the admin interface (default: ``admin``)
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- ``HOST_ANTISPAM``: the container that is running the antispam service (default: ``antispam:11334``)
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- ``HOST_WEBMAIL``: the container that is running the webmail (default: ``webmail``)
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- ``HOST_WEBDAV``: the container that is running the webdav server (default: ``webdav:5232``)
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