delivery-queue

Name

delivery-queue — LMTP/SMTP frontend for local delivery

Synopsis

delivery-queue [-c config]

Description

delivery-queue is an additional mail queue in front of delivery(8gx). It may be removed in a future version.

Options

-c config: Read configuration directives from the given file. If this option is not specified, /etc/gromox/smtp.cfg will be read if it exists.
-?: Display option summary.

All time-based command-line options and configuration file directives are subject to the syntax described in gromox(7), section "Duration specifications".

Configuration directives (gromox.cfg)

The following directives are recognized when reading from /etc/gromox/gromox.cfg, or when the -c option is used to specify a custom file:

daemons_fd_limit: In gromox-delivery-queue, this is treated as an alias for lda_fd_limit.
lda_fd_limit: Request that the file descriptor table be at least this large. The magic value 0 indicates that the system default hard limit (rlim_max, cf. setrlimit(2)) should be used.

Default: 0
lda_recipient_delimiter: The set of characters that separate an email address into localpart and extension. This mirrors the "recipient_delimiter" directive from postconf(5).

Default: (empty)
lda_support_haproxy: This directive sets the expectation for incoming connections to carry haproxy's "PROXY" protocol extension version 2 (2), or no such header (0). When a (reverse) proxy is placed in front of gromox-delivery-queue, the address that gxdq normally sees is the proxy address (e.g. ::1). A proxy can use this protocol extension to convey the actual client address, and gximap can pick this up for its own reporting, which in turn is useful for e.g. fail2ban setups.

Default: 0

Configuration directives (smtp.cfg)

The following directives are recognized when reading from /etc/gromox/smtp.cfg, or when the -c option is used to specify a custom file:

command_protocol: Selects what kind of hello command is accepted of clients. Can be lmtp, smtp or both.

Default: both
config_file_path: Colon-separated list of directories which will be scanned when locating further configuration files, especially those used by plugin instances.

Default: /etc/gromox/smtp:/etc/gromox
context_average_mem: Default: 256K
context_max_mem: Default: 2M
context_num: Default: 200
data_file_path: Colon-separated list of directories which will be scanned when locating data files.

Default: /usr/share/gromox/smtp
host_id: A unique identifier for this system. It is used for greeting lines emitted by delivery-queue on the network.

Default: (system hostname)
lda_listen_addr: AF_INET6 socket address to bind the LDA service to.

Default: ::
lda_listen_port: The TCP port to export the SMTP protocol service on.

Default: 25
lda_listen_tls_port: The TCP port to expose the implicit-TLS SMTP protocol service on.

Default: (unset)
lda_log_file: Target for log messages here. Special values: "-" (stderr/syslog depending on parent PID) or "syslog" are recognized.

Default: - (auto)
lda_log_level: Maximum verbosity of logging. 1=crit, 2=error, 3=warn, 4=notice, 5=info, 6=debug.

Default: 4 (notice)
lda_thread_charge_num: The maximum number of connections that each thread is allowed to process.

Default: 40
lda_thread_init_num: The minimum number of client processing threads to keep around.

Default: 1
mail_max_length: Maximum permitted length of a message.

Default: 64M
running_identity: An unprivileged user account to switch the process to after startup. To inhibit the switch, assign the empty value.

Default: gromox
smtp_certificate_passwd: The password to unlock TLS certificates.

Default: (unset)
smtp_certificate_path: A colon-separated list of TLS certificate files. The complete certificate chain should be present (as there is no other config directive to pull CA certs in, and implicit loading from system directories is not guaranteed by Gromox).

Default: (unset)
smtp_conn_timeout: If an SMTP connection is inactive for the given period, the connection is terminated.

Default: 3 minutes
smtp_force_starttls: This flag controls whether clients must utilize TLS, either by way of implicit TLS (cf. lda_listen_tls_port), or through the STARTTLS command.

Default: false
smtp_private_key_path: A colon-separated list of TLS certificate private key files.

Default: (unset)
smtp_support_pipeline: This flag controls the offering of the PIPELINING extension (RFC 2920) to clients.

Default: true
smtp_support_starttls: This flag controls the offering of the STARTTLS extension (RFC 3027) to clients.

Default: false
tls_min_proto: The lowest TLS version to offer. Possible values are: tls1.0, tls1.1, tls1.2, and, if supported by the system, tls1.3.

Default: tls1.2

Files

data_file_path/smtp_code.txt: Mapping from internal SMTP error codes to textual descriptions.
/usr/lib/gromox/libgxs_*.so: flusher plugins
/usr/lib/gromox/libgxs_*.so: service plugins