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email message filing system which monitors multiple inbound Maildir folders

Project description

Latest release 20191006: Update for recent cs.deco.cachedmethod rename.

Mailfiler is my email message filing system.

It monitors multiple Maildir folders for new messages and files them according to various easy to write rules. Its use is described fully in the mailfiler(1cs) manual entry.

The rules files are broadly quite simple and described fully in the mailfiler(5cs) manual entry. The rules are normally single line rules of the form:

target,... label condition

If the rule should always fire then the condition may be omitted.

The targets may be mail folders (file the message in the named folder), assignment statements (set an environment variable), email addresses (send the message to the specified address) or some other special purpose actions.

The conditions are usually tests of the header email addresses including whether an address is a member of some group/alias but may also test various other things about the message headers.

Class Condition_AddressMatch

MRO: _Condition, cs.obj.O
A condition testing for the presence of an address.

Class Condition_HeaderFunction

MRO: _Condition, cs.obj.O
A condition testing the contents of a header.

Class Condition_InGroups

MRO: _Condition, cs.obj.O
A condition testing messages addresses against address groups.

Class Condition_Regexp

MRO: _Condition, cs.obj.O
A condition testing headers against a regular expression.

Function current_value(envvar, cfg, cfg_key, default, environ)

Compute a configurable path value on the fly.

Function FilterReport(rule, matched, saved_to, ok_actions, failed_actions)

Create a FilterReport object.


  • rule: the Rule on which to report
  • matched: whether the rule was matched
  • saved_to: where messages were filed
  • ok_actions: actions which succeeded
  • failed_actions: actions which failed

Function get_target(s, offset, quoted=False)

Parse a single target specification from a string; return Target and new offset.


  • s: the string to parse
  • offset: the starting offset of the parse
  • quoted: if true then the parser is already inside quotes: do not expect comma or whitespace to end the target specification. Default: False

Function get_targets(s, offset)

Parse list of targets from the string s starting at offset. Return the list of Targets strings and the new offset.

Function maildir_from_name(mdirname, maildir_root, maildir_cache)

Return the Maildir derived from mdirpath.

Class MailFiler

MRO: cs.obj.O
A mail filer.

Method MailFiler.__init__(self, config_path, environ=None)

Initialise the MailFiler.


  • config_path: location of config file, default from DEFAULT_MAILFILER_RC.
  • environ: initial environment, default from os.environ.

Function main(argv=None, stdin=None)

Mailfiler main programme.

Class MessageFiler

MRO: cs.obj.O
A message filing object, filtering state information used during rule evaluation.


  • .maildb: Current MailDB.
  • .environ: Storage for variable settings.
  • .addresses(header): Caching list of addresses from specified header.

Method MessageFiler.__init__(self, context, environ=None)

context: External state object, with maildb property, etc.. environ: Mapping which supplies initial variable names. Default from os.environ.

Function parserules(fp)

Read rules from fp, yield Rules.

Function resolve_mail_path(mdirpath, maildir_root)

Return the full path to the requested mail folder.

Class Rule

MRO: cs.obj.O
A filing rule.

Class Rules

MRO: builtins.list
Simple subclass of list storing rules, with methods to load rules and filter a message using the rules.

Function save_to_folderpath(folderpath, M, message_path, flags)

Save the Message M to the resolved folderpath.


  • folderpath: the path to the target mail folder.
  • M: the message to save.
  • message_path: pathname of existing message file, allowing hardlinking to new maildir if not None.
  • flags: save flags as from MessageFiler.flags

Function scrub_header(value)

"Scrub" a header value. Presently this means to undo RFC2047 encoding where possible.

Class Target_Assign

MRO: cs.obj.O
A filing target to set a filing state environment variable.

Class Target_EnvSub

MRO: cs.obj.O
A filing target to delivery to a string which is subject to environment subject to environment variable expansion where the environment variables are derived from the filing state.

Class Target_Function

MRO: cs.obj.O
A filing target to run a Python function against a message.

Class Target_MailAddress

MRO: cs.obj.O
A filing target for an email address.

Class Target_MailFolder

MRO: cs.obj.O
A filing target for a mail folder.

Class Target_PipeLine

MRO: cs.obj.O
A filing target to pipe the message contents to a shell command.

Class Target_SetFlag

MRO: cs.obj.O
A filing target to apply a flag to a message.

Class Target_Substitution

MRO: cs.obj.O
A filing target to apply a regular expression string substitution to message headers.

Class WatchedMaildir

MRO: cs.obj.O
A class to monitor a Maildir and filter messages.

Release Log

Release 20191006: Update for recent cs.deco.cachedmethod rename.

Release 20190512: Promote $DEFAULT to a list of targets. Implement save-to-self "." target to support folders where filing elsewhere is an exception. Move the manual entries to Markdown format.

Release 20190103.1: DISTINFO fix.

Release 20190103: Various fixes. Documentation improvements.

Release 20160828: Update metadata with "install_requires" instead of "requires". A few bugfixes.

Release 20160403: Bug fix for new $ALERT_TARGETS feature.

Release 20160402: Make rule processing more robust in the face of errors in individual targets. Add "report" operation for debugging rules against a test message. Add "function" targets. Make header values available for use in substitution rules. Allow local@domain and @domain inside (...|...) group matches. Honour new $ALERT_TARGETS variable for addition targets implied by issues an alert for a message.

Release 20150805: better handling of configuration errors substitution actions accept multiple header names initial "scrub" action fiddle headers of resent messages to avoid blowback to original authors

Release 20150118.6: further README updates

Release 20150118.5: more README formatting

Release 20150118.4: more README fixes

Release 20150118.3: README fixes

Release 20150118.2: doc updates

Release 20150118: Initial PyPI release.

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