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KOPANO-DAGENT.CFG(5) Kopano Core user reference KOPANO-DAGENT.CFG(5)


kopano-dagent.cfg - The Kopano dagent configuration file




The dagent.cfg is a configuration file for the Kopano Dagent. dagent.cfg contains instructions for the software to set up the logging system and LMTP settings.


The file consists of one big section, but parameters can be grouped by functionality.

The parameters are written in the form:

name = value

The file is line-based. Each newline-terminated line represents either a comment, nothing, a parameter or a directive. A line beginning with `#' is considered a comment, and will be ignored by Kopano. Parameter names are case sensitive. Lines beginning with `!' are directives.

Directives are written in the form:

!directive [argument(s)]

The following directives exist:


Include and process argument

Example: !include common.cfg



Unix socket to find the connection to the Kopano server.

Default: file:///var/run/kopano/server.sock


After correctly starting, the dagent process will become this user, dropping root privileges. Note that the log file needs to be writeable by this user, and the directory too to create new logfiles after logrotation. This can also be achieved by setting the correct group and permissions.

Default value is empty, not changing the user after starting.


After correctly starting, the dagent process will become this group, dropping root privileges.

Default value is empty, not changing the group after starting.


Write the process ID number to this file. This is used by the init.d script to correctly stop/restart the service.

Default: /var/run/kopano/


When a crash occurs or an assertion fails, a coredump file can be generated by the system for use with a crash report. For details, see the kopano-coredump(5) manpage.

Default: systemdefault


You can change the process model between fork and thread. The forked model uses more resources.

Default: fork


Use this file as key to logon to the server. This is only used when server_socket is set to an HTTPS transport. See the kopano-server(8) manual page on how to setup SSL keys.

Default: value not set.


The password of the SSL key file that is set in sslkey_file.

Default: value not set.


A space-separated list of address:port specifiers for where the server should listen for connections. IPv6 addresses need to be enclosed in brackets (as in [2001:db8::1]:236). The asterisk is the multi-protocol address ("*:2003"). Local sockets are supported with "unix:/path". Hostnames are not allowed (since the mapped address can resolve to multiple addresses, any of which can change without notice).

Default: *:2003

To set up a secure local socket that is only accessible by Postfix, a directory like this may be created:

	mkdir -p /var/spool/kopano
	chown kopano:kopano /var/spool/kopano
	chmod go= /var/spool/kopano
	setfacl -m u:postfix:rwx /var/spool/kopano
In dagent.cfg, the listen line would be:
	lmtp_listen = unix:/var/spool/kopano/dagent.sock
And in postfix's, a transport line might look like:
	virtual_transport = lmtp:unix:/var/spool/kopano/dagent.sock


The maximum number of LMTP threads that can be running simultaneously. This is also limited by your SMTP server. (20 is the postfix default concurrency limit)

Default: 20


To detect if the receiving mail is spam, the DAgent can check this header for a value that is in there. This name is case insensitive. If this option is empty, the detection method will be turned off. You can also force a delivery to the Junk Mail folder using the -j commandline option.

Default: X-Spam-Status


When this value is found in the spam_header_name, the mail will be considered spam, and will be delivered in the user's Junk Mail folder. The value can be anywhere in the header, not just the start. The value is case insensitive.

Default: Yes,


The method which should be used for logging. Valid values are:
Use the syslog service. Messages will be sent using the "mail" facility tag. See also journald.conf(5) or syslog.conf(5).
Log to a file. The filename will be specified in log_file.
Autoselect mode: If log_file is set, that will be used. Else, syslog will be used if it looks like it is available. Else, stderr.

Default: auto


When logging to a file, specify the filename in this parameter. Use - (minus sign) for stderr output.

Default: -


Specify whether to prefix each log line with a timestamp in 'file' logging mode.

Default: yes


Buffer logging in what sized blocks. The special value 0 selects line buffering.

Default: 0


The level of output for logging in the range from 0 to 6. "0" means no logging, "1" for critical messages only, "2" for error or worse, "3" for warning or worse, "4" for notice or worse, "5" for info or worse, "6" debug.

Default: 3


A space-separated list of usernames for whom the incoming Internet e-mail (RFC 5322) messages should be dumped to files in the directory specified by log_raw_message_path. Alternatively, instead of such a list, the following magic keywords are recognized:
yes, all
Dump incoming messages irrespective of recipient.
Do not dump any incoming messages.
Only dump when automatic processing programs (e.g. kopano-mr-process(8) or kopano-mr-accept(8)) have returned a non-success exit code.

Default: error


Path to save the raw message.

Default: /var/lib/kopano


Archive incoming message on delivery. If an archive is attached to the target mailbox, the message will immediately be archived upon delivery.

Rules will be processed before the message is archived, so when a rule moves the message to an alternate location, the archived message will be placed in the correct location in the archive. When the incoming message is copied by a rule, only the original message is archived.

Default: no


Kopano-dagent can auto-accept meeting requests if the mr-accept option is enabled for a user. When this option is enabled and a meeting request or meeting cancellation is received, this script is started with the following parameters: /usr/sbin/kopano-mr-accept <username> </path/to/dagent.cfg> [<ENTRYID>].

If the script is successful (exitcode is 0), then no other actions are performed (eg rules or vacation messages) and the message is not delivered in the inbox. If the script exits with a non-zero exit code, rules and vacation messages are run as usual, and the message is delivered in the inbox (or other folder, depending on rules or options).

Default: /usr/sbin/kopano-mr-accept


Kopano-dagent can auto-process meeting requests. When this is enabled and a meeting request, response or meeting cancellation is received, this script is started with the following parameters: /usr/bin/kopano-mr-process <username> </path/to/dagent.cfg> [<ENTRYID>].

Default: /usr/bin/kopano-mr-process


Kopano-dagent invokes the autoresponder to send out-of-office replies. You can configure a custom autoresponder using this configuration option.

Default: /usr/sbin/kopano-autorespond


Enable or disable the dagent plugin framework.

Default: yes


The path to the dagent plugin manager.

Default: /usr/share/kopano-dagent/python


Path to the activated dagent plugins. This folder contains symlinks to the kopano plugins and custom scripts. The plugins are installed in /usr/share/kopano-dagent/python/plugins. To activate a plugin create a symbolic link in the plugin_path directory.


ln -s /usr/share/kopano-dagent/python/plugins/ /var/lib/kopano/dagent/plugins/

Default: /var/lib/kopano/dagent/plugins


Some emails do not contain any charset information or specify US-ASCII even though it is not. In both cases, dagent will assume the following charset is used. The given charset must be a superset of US-ASCII (many charsets are), and it must not be a charset where ASCII bytes get a new meaning due to state shifting, ruling out ISO-2022-JP.

Default: us-ascii


Enable the addition of X-Kopano-Rule-Action headers on messages that have been forwarded or replied by a rule.

Default: yes


Enable this option to prevent rules to cause a loop. An e-mail can only be forwarded once. When this option is enabled, the set_rule_headers option must also be enabled.

Default: yes


A list of space-separated domains to which forwarding via a rule is allowed. The "*" matches zero or more characters (including dots, i.e. subdomains at multiple levels). Do not use "*" to permit both "" and "", as that would also allow "". There is an implementation-specific limitation of 1024 characters.

Default: *


This directive overrides forward_whitelist_domains and sources domains from the specified file instead.

Default: (empty)


A custom-defined reply subject to the user with a rule forwarding to a domain not in forward_whitelist_domains.

Default: REJECT: %subject not forwarded (administratively blocked)


A custom-defined reply message to the user with a rule forwarding to a domain not in forward_whitelist_domains. There is no way to specify newlines.

Default: The Kopano mail system has rejected your request to forward your e-mail with subject %subject (via mail filters) to %sender: the operation is not permitted.\n\nRemove the rule or contact your administrator about the forward_whitelist_domains setting.


This directive overrides forward_whitelist_domain_message and sources the message from the specified file instead.

Default: (empty)


A space-separated list of pairs of space-separated charset name and replacement to use when encountering mail bodies with unrecognized character set encodings. This is a lossy operation; its use is not recommended. Normally, dagent would store such mail bodies as attachments to preserve their content, with decoding left to the user who can try any number of encodings, not just one.


By default, only well-known headers of an e-mail that Kopano makes use of (or which Outlook makes use of), such as From, To, and so on, are turned into MAPI properties. All others are generally discarded during the transformation of the e-mail to a MAPI message. If your organization needs certain fields to persist within the MAPI message, the indexed_headers directive may be used to list the header fields to keep.

Default: (empty)


A HTTP URL or filesystem-local socket specification for a kopano-statsd compatible web service that ingests service statistics such as memory usage or mail processing counters.


Default: unix:/var/run/kopano/statsd.sock


The time interval at which the statsd service is to be contacted, in seconds. When "statsclient_url" points to a kopano-statsd instance, the value should be 60 (for now), because its rrdtool archives are set to expect data at this rate.

Default: 0 (submission service is deactivated)


This setting can be used to control SSL certificate validation.

Default: yes


When Internet e-mail messages are converted to MAPI message objects, the presence of rich-text body alternatives will cause them to be chosen and stored as attachments, discarding the plaintext and HTML copies. Since this choice is not always obvious to the end-user, the enablement of this directive will substitute an explanatory PR_BODY text if that happens.

Default: no


The following options are reloadable by sending the kopano-dagent process a HUP signal:

log_level, archive_on_delivery, mr_autoaccepter


The Kopano dagent configuration file.


Written by Kopano.


November 2016 Kopano 8