Mail::SpamAssassin::PerMsgStatus (3)

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NAME

Mail::SpamAssassin::PerMsgStatus - per-message status (spam or not-spam)

SYNOPSIS

  my $spamtest = new Mail::SpamAssassin ({
    'rules_filename'      => '/etc/spamassassin.rules',
    'userprefs_filename'  => $ENV{HOME}.'/.spamassassin/user_prefs'
  });
  my $mail = $spamtest->parse();

  my $status = $spamtest->check ($mail);

  my $rewritten_mail;
  if ($status->is_spam()) {
    $rewritten_mail = $status->rewrite_mail ();
  }
  ...

DESCRIPTION

The Mail::SpamAssassin "check()" method returns an object of this class. This object encapsulates all the per-message state.

METHODS

$status->check ()

Runs the SpamAssassin rules against the message pointed to by the object.

$status->learn()

After a mail message has been checked, this method can be called. If the score is outside a certain range around the threshold, ie. if the message is judged more-or-less definitely spam or definitely non-spam, it will be fed into SpamAssassin's learning systems (currently the naive Bayesian classifier), so that future similar mails will be caught.

$score = $status->get_autolearn_points()

Return the message's score as computed for auto-learning. Certain tests are ignored:

  - rules with tflags set to 'learn' (the Bayesian rules)

  - rules with tflags set to 'userconf' (user white/black-listing rules, etc)

  - rules with tflags set to 'noautolearn'

Also note that auto-learning occurs using scores from either scoreset 0 or 1, depending on what scoreset is used during message check. It is likely that the message check and auto-learn scores will be different.

$score = $status->get_head_only_points()

Return the message's score as computed for auto-learning, ignoring all rules except for header-based ones.

$score = $status->get_learned_points()

Return the message's score as computed for auto-learning, ignoring all rules except for learning-based ones.

$score = $status->get_body_only_points()

Return the message's score as computed for auto-learning, ignoring all rules except for body-based ones.

$score = $status->get_autolearn_force_status()

Return whether a message's score included any rules that are flagged as autolearn_force.

$rule_names = $status->get_autolearn_force_names()

Return a list of comma separated list of rule names if a message's score included any rules that are flagged as autolearn_force.

$isspam = $status->is_spam ()

After a mail message has been checked, this method can be called. It will return 1 for mail determined likely to be spam, 0 if it does not seem spam-like.

$list = $status->get_names_of_tests_hit ()

After a mail message has been checked, this method can be called. It will return a comma-separated string, listing all the symbolic test names of the tests which were triggered by the mail.

$list = $status->get_names_of_tests_hit_with_scores_hash ()

After a mail message has been checked, this method can be called. It will return a pointer to a hash for rule & score pairs for all the symbolic test names and individual scores of the tests which were triggered by the mail.

$list = $status->get_names_of_tests_hit_with_scores ()

After a mail message has been checked, this method can be called. It will return a comma-separated string of rule=score pairs for all the symbolic test names and individual scores of the tests which were triggered by the mail.

$list = $status->get_names_of_subtests_hit ()

After a mail message has been checked, this method can be called. It will return a comma-separated string, listing all the symbolic test names of the meta-rule sub-tests which were triggered by the mail. Sub-tests are the normally-hidden rules, which score 0 and have names beginning with two underscores, used in meta rules.

$num = $status->get_score ()

After a mail message has been checked, this method can be called. It will return the message's score.

$num = $status->get_required_score ()

After a mail message has been checked, this method can be called. It will return the score required for a mail to be considered spam.

$num = $status->get_autolearn_status ()

After a mail message has been checked, this method can be called. It will return one of the following strings depending on whether the mail was auto-learned or not: ``ham'', ``no'', ``spam'', ``disabled'', ``failed'', ``unavailable''.

It also returns is flagged with auto_learn_force, it will also include the status and the rules hit. For example: ``autolearn_force=yes (

AUTOLEARNTEST_BODY

)''

$report = $status->get_report ()

Deliver a ``spam report'' on the checked mail message. This contains details of how many spam detection rules it triggered.

The report is returned as a multi-line string, with the lines separated by "\n" characters.

$preview = $status->get_content_preview ()

Give a ``preview'' of the content.

This is returned as a multi-line string, with the lines separated by "\n" characters, containing a fully-decoded, safe, plain-text sample of the first few lines of the message body.

$msg = $status->get_message()

Return the object representing the message being scanned.

$status->rewrite_mail ()

Rewrite the mail message. This will at minimum add headers, and at maximum MIME-encapsulate the message text, to reflect its spam or not-spam status. The function will return a scalar of the rewritten message.

The actual modifications depend on the configuration (see "Mail::SpamAssassin::Conf" for more information).

The possible modifications are as follows:

To:, From: and Subject: modification on spam mails

Depending on the configuration, the To: and From: lines can have a user-defined

RFC 2822

comment appended for spam mail. The subject line may have a user-defined string prepended to it for spam mail.

X-Spam-* headers for all mails

Depending on the configuration, zero or more headers with names beginning with "X-Spam-" will be added to mail depending on whether it is spam or ham.

spam message with report_safe

If report_safe is set to true (1), then spam messages are encapsulated into their own message/rfc822

MIME

attachment without any modifications being made.

If report_safe is set to false (0), then the message will only have the above headers added/modified.

$status->action_depends_on_tags($tags, $code, @args)

Enqueue the supplied subroutine reference $code, to become runnable when all the specified tags become available. The $tags may be a simple scalar - a tag name, or a listref of tag names. The subroutine &$code when called will be passed a "permessagestatus" object as its first argument, followed by the supplied (optional) list @args .

$status->set_tag($tagname, $value)

Set a template tag, as used in "add_header", report templates, etc. This

API

is intended for use by plugins. Tag names will be converted to an all-uppercase representation internally.

$value can be a simple scalar (string or number), or a reference to an array, in which case the public method get_tag will join array elements using a space as a separator, returning a single string for backward compatibility.

$value can also be a subroutine reference, which will be evaluated each time the template is expanded. The first argument passed by get_tag to a called subroutine will be a PerMsgStatus object (this module's object), followed by optional arguments provided a caller to get_tag.

Note that perl supports closures, which means that variables set in the caller's scope can be accessed inside this "sub". For example:

    my $text = "hello world!";
    $status->set_tag("FOO", sub {
              my $pms = shift;
              return $text;
            });

See "Mail::SpamAssassin::Conf"'s "TEMPLATE TAGS" section for more details on how template tags are used.

"undef" will be returned if a tag by that name has not been defined.

$string = $status->get_tag($tagname)

Get the current value of a template tag, as used in "add_header", report templates, etc. This

API

is intended for use by plugins. Tag names will be converted to an all-uppercase representation internally. See "Mail::SpamAssassin::Conf"'s "TEMPLATE TAGS" section for more details on tags.

"undef" will be returned if a tag by that name has not been defined.

$string = $status->get_tag_raw($tagname, @args)

Similar to "get_tag", but keeps a tag name unchanged (does not uppercase it), and does not convert arrayref tag values into a single string.

$status->set_spamd_result_item($subref)

Set an entry for the spamd result log line. $subref should be a code reference for a subroutine which will return a string in 'name=VALUE' format, similar to the other entries in the spamd result line:

  Jul 17 14:10:47 radish spamd[16670]: spamd: result: Y 22 - ALL_NATURAL,
  DATE_IN_FUTURE_03_06,DIET_1,DRUGS_ERECTILE,DRUGS_PAIN,
  TEST_FORGED_YAHOO_RCVD,TEST_INVALID_DATE,TEST_NOREALNAME,
  TEST_NORMAL_HTTP_TO_IP,UNDISC_RECIPS scantime=0.4,size=3138,user=jm,
  uid=1000,required_score=5.0,rhost=localhost,raddr=127.0.0.1,
  rport=33153,mid=<9PS291LhupY>,autolearn=spam

"name" and "VALUE" must not contain "=" or "," characters, as it is important that these log lines are easy to parse.

The code reference will be called by spamd after the message has been scanned, and the "PerMsgStatus::check()" method has returned.

$status->finish ()

Indicate that this $status object is finished with, and can be destroyed.

If you are using SpamAssassin in a persistent environment, or checking many mail messages from one "Mail::SpamAssassin" factory, this method should be called to ensure Perl's garbage collection will clean up old status objects.

$name = $status->get_current_eval_rule_name()

Return the name of the currently-running eval rule. "undef" is returned if no eval rule is currently being run. Useful for plugins to determine the current rule name while inside an eval test function call.

$status->get_decoded_body_text_array ()

Returns the message body, with base64 or quoted-printable encodings decoded, and non-text parts or non-inline attachments stripped.

It is returned as an array of strings, with each string representing one newline-separated line of the body.

$status->get_decoded_stripped_body_text_array ()

Returns the message body, decoded (as described in get_decoded_body_text_array()), with

HTML

rendered, and with whitespace normalized.

It will always render text/html, and will use a heuristic to determine if other text/* parts should be considered text/html.

It is returned as an array of strings, with each string representing one 'paragraph'. Paragraphs, in plain-text mails, are double-newline-separated blocks of multi-line text.

$status->get (header_name [, default_value])

Returns a message header, pseudo-header, real name or address. "header_name" is the name of a mail header, such as 'Subject', 'To', etc. If "default_value" is given, it will be used if the requested "header_name" does not exist.

Appending ":raw" to the header name will inhibit decoding of quoted-printable or base-64 encoded strings.

Appending a modifier ":addr" to a header field name will cause everything except the first email address to be removed from the header field. It is mainly applicable to header fields 'From', 'Sender', 'To', 'Cc' along with their 'Resent-*' counterparts, and the 'Return-Path'. For example, all of the following will result in ``example@foo'':

example@foo

example@foo (Foo Blah)

example@foo, example@bar

display: example@foo (Foo Blah), example@bar ;

Foo Blah <example@foo>

Foo Blah <example@foo>

'Foo Blah' <example@foo>

Appending a modifier ":name" to a header field name will cause everything except the first display name to be removed from the header field. It is mainly applicable to header fields containing a single mail address: 'From', 'Sender', along with their 'Resent-From' and 'Resent-Sender' counterparts. For example, all of the following will result in ``Foo Blah''. One level of single quotes is stripped too, as it is often seen.

example@foo (Foo Blah)

example@foo (Foo Blah), example@bar

display: example@foo (Foo Blah), example@bar ;

Foo Blah <example@foo>

Foo Blah <example@foo>

'Foo Blah' <example@foo>

There are several special pseudo-headers that can be specified:

ALL can be used to mean the text of all the message's headers.

ALL-TRUSTED can be used to mean the text of all the message's headers that could only have been added by trusted relays.

ALL-INTERNAL can be used to mean the text of all the message's headers that could only have been added by internal relays.

ALL-UNTRUSTED can be used to mean the text of all the message's headers that may have been added by untrusted relays. To make this pseudo-header more useful for header rules the 'Received' header that was added by the last trusted relay is included, even though it can be trusted.

ALL-EXTERNAL can be used to mean the text of all the message's headers that may have been added by external relays. Like ALL-UNTRUSTED the 'Received' header added by the last internal relay is included.

ToCc can be used to mean the contents of both the 'To' and 'Cc' headers.

EnvelopeFrom is the address used in the '

MAIL FROM:

' phase of the

SMTP

transaction that delivered this message, if this data has been made available by the

SMTP

server.

MESSAGEID is a symbol meaning all Message-Id's found in the message; some mailing list software moves the real 'Message-Id' to 'Resent-Message-Id' or 'X-Message-Id', then uses its own one in the 'Message-Id' header. The value returned for this symbol is the text from all 3 headers, separated by newlines.

X-Spam-Relays-Untrusted is the generated metadata of untrusted relays the message has passed through

X-Spam-Relays-Trusted is the generated metadata of trusted relays the message has passed through

$status->get_uri_list ()

Returns an array of all unique URIs found in the message. It takes a combination of the URIs found in the rendered (decoded and

HTML

stripped) body and the URIs found when parsing the

HTML

in the message. Will also set $status->{uri_list} (the array as returned by this function).

The returned array will include the ``raw''

URI

as well as ``slightly cooked'' versions. For example, the single

URI

'%77&#00119;%77.example.com/' will get turned into: ( '%77&#00119;%77.example.com/', 'http://www.example.com/' )

$status->get_uri_detail_list ()

Returns a hash reference of all unique URIs found in the message and various data about where the URIs were found in the message. It takes a combination of the URIs found in the rendered (decoded and

HTML

stripped) body and the URIs found when parsing the

HTML

in the message. Will also set $status->{uri_detail_list} (the hash reference as returned by this function). This function will also set $status->{uri_domain_count} (count of unique domains).

The hash format looks something like this:

  raw_uri => {
    types => { a => 1, img => 1, parsed => 1 },
    cleaned => [ canonicalized_uri ],
    anchor_text => [ "click here", "no click here" ],
    domains => { domain1 => 1, domain2 => 1 },
  }

"raw_uri" is whatever the

URI

was in the message itself (spamassassin.apache%2Eorg

"types" is a hash of the

HTML

tags (lowercase) which referenced the raw_uri. parsed is a faked type which specifies that the raw_uri was seen in the rendered text.

"cleaned" is an array of the raw and canonicalized version of the raw_uri (spamassassin.apache%2Eorg spamassassin.apache.org

"anchor_text" is an array of the anchor text (text between <a> and </a>), if any, which linked to the

URI.

"domains" is a hash of the domains found in the canonicalized URIs.

"hosts" is a hash of unstripped hostnames found in the canonicalized URIs as hash keys, with their domain part stored as a value of each hash entry.

$status->clear_test_state()

Clear test state, including test log messages from "$status->test_log()".

$status->got_hit ($rulename, $desc_prepend [, name => value, ...])

Register a hit against a rule in the ruleset.

There are two mandatory arguments. These are $rulename, the name of the rule that fired, and $desc_prepend, which is a short string that will be prepended to the rules "describe" string in output reports.

In addition, callers can supplement that with the following optional data:

score => $num

Optional: the score to use for the rule hit. If unspecified, the value from the "Mail::SpamAssassin::Conf" object's "{scores}" hash will be used (a configured score), and in its absence the "defscore" option value.

defscore => $num

Optional: the score to use for the rule hit if neither the option "score" is provided, nor a configured score value is provided.

value => $num

Optional: the value to assign to the rule; the default value is 1. tflags multiple rules use values of greater than 1 to indicate multiple hits. This value is accessible to meta rules.

ruletype => $type

Optional, but recommended: the rule type string. This is used in the "hit_rule" plugin call, called by this method. If unset, 'unknown' is used.

tflags => $string

Optional: a string, i.e. a space-separated list of additional tflags to be appended to an existing list of flags in $self->{conf}->{tflags}, such as: ``nice noautolearn multiple''. No syntax checks are performed.

description => $string

Optional: a custom rule description string. This is used in the "hit_rule" plugin call, called by this method. If unset, the static description is used.

Backward compatibility: the two mandatory arguments have been part of this

API

since SpamAssassin 2.x. The optional name=<gtvalue> pairs, however, are a new addition in SpamAssassin 3.2.0.

$status->create_fulltext_tmpfile (fulltext_ref)

This function creates a temporary file containing the passed scalar reference data (typically the full/pristine text of the message). This is typically used by external programs like pyzor and dccproc, to avoid hangs due to buffering issues. Methods that need this, should call $self->create_fulltext_tmpfile($fulltext) to retrieve the temporary filename; it will be created if it has not already been.

Note: This can only be called once until $status->delete_fulltext_tmpfile() is called.

$status->delete_fulltext_tmpfile ()

Will cleanup after a $status->create_fulltext_tmpfile() call. Deletes the temporary file and uncaches the filename.

all_from_addrs_domains

This function returns all the various from addresses in a message using all_from_addrs() and then returns only the domain names.

SEE ALSO

"Mail::SpamAssassin" "spamassassin"