#api #automation #server

app imserious

Execute commands in response to Internet Message Store Events

2 unstable releases

0.2.0 May 19, 2022
0.1.0 May 15, 2022

#228 in Email

MIT license

543 lines


Execute commands in response to Dovecot Internet Message Store Events.


imserious [-t] [-c file]
imserious [--test] [--config file]
imserious [-hv]
imserious [--help] [--version]
Optional arguments:
  -h, --help           print help message
  -v, --version        print program version
  -t, --test           test configuration
  -c, --config CONFIG  path to configuration


IMSErious is a service that listens for Dovecot push notification events, as sent by its OX (Open-Xchange) driver, and executes commands in response. This allows, for example, waking up an MRA or issuing desktop notifications on new messages.


IMSErious is configured from a TOML file specified as the first argument, defaulting to /usr/local/etc/imserious.toml:

listen = ""  # listen address, default
allow = [ "" ]  # allowed notification IP ranges, default all
endpoint = "/notify"       # path to API endpoint, default /notify
max_connections = 8        # connection limit, default 8
timeout = "5s"             # request timeout, default 5s

# optional Basic auth
user = "foo"
pass = "bar"

# optional TLS
cert = "/etc/ssl/foo.example.com.crt"
key = "/etc/ssl/foo.example.com.key"
periodic_reload = "1d" # optionally reload keys periodically, no default

# optional stdout logging
max_level = "info"    # One of error, warn, info (default), debug, trace
                      # May be overridden by setting IMSERIOUS_LOG env var
format = "compact"    # One of full (default), compact, pretty, json
ansi = false          # Format "pretty" with ANSI codes, default false
timestamp = false     # Display a timestamp, default false
target = false        # Display the log target, default false
level = false         # Display the log level, default false

user = "freaky"       # Username, required
event = "MessageNew"  # Event type, optional, default MessageNew
                      # Note this is currently the only type supported by Dovecot's OX driver
delay = "5s"          # Delay execution this long after initial event, optional, default none
limit_period = "30s"  # Rate limit executions over this interval, optional, default 30s
limit_burst = 1       # Allow this many executions per interval, optional, default 1
periodic = "300s"     # Execute unconditionally after this long, optional, default none
command = "/usr/local/bin/fdm -a eda -l fetch"


A handler is a command to execute in response to a specific event/user pair. Multiple handlers for the same event and user may be specified to trigger different commands with their own rate limits, periodic configuration, etc.

Commands only support basic shell word splitting and quoting - if shell metacharacters are required they should be provided by executing via a shell such as with /bin/sh -c.

Event fields will be exposed in IMSE_* env vars if available - only IMSE_USER and IMSE_EVENTare guaranteed to be set if periodic execution is specified.

  • IMSE_USER - user being notified
  • IMSE_EVENT - event name
  • IMSE_REMOTE_IP - notifying IP address
  • IMSE_REMOTE_PORT - notifying TCP port
  • IMSE_UNSEEN - number of unseen messages
  • IMSE_FOLDER - IMAP folder name
  • IMSE_FROM - From: address of a new email (if any)
  • IMSE_SNIPPET - a sample of the body of a new email (if any)


It should not need to be said that there are potentially serious security implications from allowing remote clients to trigger commands on your server. While every effort has been made to limit the potential for harm, it is your responsibility not to use this program unsafely.

It is strongly discouraged to run an open instance of IMSErious on a public network, or as a privileged user.


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