5.6.2 External Tests

Test: numaddr [:over | :under] header-names(string-list) count(number)

Synopsis:

require "test-numaddr";
…
if numaddr args
  {
    …
  }

Description: This test is provided as an example of loadable extension tests. You must use ‘require "test-numaddr"’ statement before actually using it.

The numaddr test counts Internet addresses in structured headers that contain addresses. It returns true if the total number of addresses satisfies the requested relation.

If the tagged argument is ‘:over’ and the number of addresses is greater than count, the test is true; otherwise, it is false.

If the tagged argument is ‘:under’ and the number of addresses is less than count, the test is true; otherwise, it is false.

If the tagged argument is not given, ‘:over’ is assumed.

Test: pipe [:envelope] [:header] [:body] [:exit code(number)] [:signal code(number)] command(string)

Synopsis:

require "test-pipe";

if pipe command
  {
    …
  }

Description: The pipe test executes a shell command specified by its argument and pipes the entire message (including envelope) to its standard input. When given, tags :envelope, :header, and :body control what parts of the message to pipe to the command.

In the absence of the :exit tag, the test returns true if the command exits with code 0. If :exit is given, the test returns true if the command exits with code equal to its argument.

The :signal tag determines the result of the test in case if the program exits on signal. By default, the test returns false. If :signal is given and the number of signal which caused the program to terminate matches its argument, the test returns true.

Test: spamd [:host tcp-host(string)] [:port tcp-port(number)] [:socket unix-socket(string)] [:user name(string)] [:over | :under limit(string)]

Synopsis:

require "test-spamd";
…
if spamd args
  {
    # This is spam
    …
  }

Description: This test is an interface to SpamAssassin filter. It connects to the spamd daemon using connection parameters specified by tagged arguments :host and :port (if the daemon is listening on an INET socket), or :socket (if the daemon is listening on a UNIX socket) and returns true, if SpamAssassin qualifies the message as spam. Tagged argument limit alters the default behavior. Its value is a string representation of a floating point number. If the tag :over is used, then the test returns true if the spam score returned from SpamAssassin is greater than limit. Otherwise, if :under is used, the test returns true if the spam score is less than limit. The comparison takes into account three decimal digits.

Tagged argument :user allows to select a specific user profile. If it is not given, the user name is determined using the effective UID.

Before returning, the spamd test adds the following headers to the message:

X-Spamd-Status

‘YES’ or ‘NO’, depending on whether the message is qualified as spam or ham.

X-Spamd-Score

Actual spam score value.

X-Spamd-Threshold

Spam score threshold, as configured in SpamAssassin settings.

X-Spamd-Keywords

Comma-separated list of keywords, describing the spam checks that succeeded for this message.

Example:

request "test-spamd";

if spamd :host 127.0.0.1 :port 3333
  {
     discard;
  }

Test: list [comparator] [match-type] [ :delim delimiters(string) ] headers(string-list) keys(string-list)

Synopsis:

require "test-list";
if list args
  {
     … 
  }

Description: The list test evaluates to true if any of headers matches any key from keys. Each header is regarded as containing a list of keywords. By default, comma is assumed as list separator. This can be overridden by specifying the :delim tag, whose value is a string consisting of valid list delimiter characters.

Example:

This test can be used in conjunction with the spamd test described above:

require ["fileinto", "test-spamd", "test-list"];

if spamd :host 127.0.0.1 :port 3333
  {
     if list :matches :delim " ,"
             "X-Spamd-Keywords" [ "HTML_*", "FORGED_*" ]
       {      
          fileinto "~/mail/spam";
       }
     else
       {
          discard;
       }
  }

Test: timestamp [:before | :after] header(string) date(string)

Synopsis:

require "test-timestamp";

if timestamp arg
  {
     …
  }

Description: The timestamp test compares the value of a structured date header field (header) with the given date (date).

If the tagged argument is :after and the date from the header is after the specified date the result is true, otherwise, if the header date is before the given date, the result is false.

If the tagged argument is :before and the date from the header is before the specified date the result is true, otherwise, if the header date is after the given date, the result is false.

If no tagged argument is supplied, :after is assumed.

Almost any date format is understood. See Date Input Formats, for a detailed information on date formats.

Example:

The test below succeeds if the date in ‘X-Expire-Timestamp’ header is more than 5 days older than the current date:

require "test-timestamp";

if timestamp :before "X-Expire-Timestamp" "now - 5 days"
  {
     discard;
  }