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Spamtest and Virustest Extensions ================================= Using the spamtest and virustest extensions (RFC 5235), the Sieve language provides a uniform and standardized command interface for evaluating spam and virus tests performed on the message. Users no longer need to know what headers need to be checked and how the scanner's verdict is represented in the header field value. They only need to know how to use the spamtest (spamtestplus) and virustest extensions. This also gives GUI-based Sieve editors the means to provide a portable and easy to install interface for spam and virus filter configuration. The burden of specifying which headers need to be checked and how the scanner output is represented falls onto the Sieve administrator. The spamtest, spamtestplus and virustest extensions are not enabled by default and thus need to be enabled explicitly using the sieve_extensions setting. The following settings need to be configured for using the spamtest and spamtestplus extensions. The virustest extension has identical configuration settings, but with a `sieve_virustest_' prefix instead of a `sieve_spamtest_' prefix: sieve_spamtest_status_type = "score" / "strlen" / "text" This specifies the type of status result that the spam/virus scanner produces. This can either be a numeric score ("score"), a string of identical characters ("strlen"), e.g. '*******', or a textual description, e.g. `Spam' or `Not Spam'. sieve_spamtest_status_header = [ ":" ] This specifies the header field that contains the result information of the spam scanner and it may express the syntax of the content of the header. If no matching header is found in the message, the spamtest command will match against "0". This is a structured setting. The first part specifies the header field name. Optionally, a POSIX regular expression follows the header field name, separated by a colon. Any whitespace directly following the colon is not part of the regular expression. If the regular expression is ommitted, any header content is accepted and the full header value is used. When a regular expression is used, it must specify one match value (inside brackets) that yields the desired spam scanner result. If the header does not match the regular expression or if no value match is found, the spamtest will match against "0". sieve_spamtest_max_value = This statically specifies the maximum value a numeric spam score can have. sieve_spamtest_max_header = [ ":" ] Some spam scanners include the maximum score value in one of their status headers. Using this setting, this maximum can be extracted from the message itself in stead of specifying the maximum manually using the setting `sieve_spamtest_max_value' explained above. The syntax is identical to the `sieve_spamtext_status_header' setting. sieve_spamtest_text_valueX = When the `sieve_spamtest_status_type' setting is set to "text", these settings specify that the spamtest command will match against "X" when the specified string is equal to the text (extracted) from the status header. For spamtest, values of X between 0 and 10 are recognized, while virustest only uses values between 0 and 5. Examples ======== This section shows several configuration examples. Each example shows a specimen of valid virus/spam test headers that the given configuration will work on. Example 1 --------- Spam header: `X-Spam-Score: No, score=-3.2' plugin { sieve_extensions = +spamtest +spamtestplus sieve_spamtest_status_type = score sieve_spamtest_status_header = \ X-Spam-Score: [[:alnum:]]+, score=(-?[[:digit:]]+\.[[:digit:]]) sieve_spamtest_max_value = 5.0 } Example 2 --------- Spam header: `X-Spam-Status: Yes' plugin { sieve_extensions = +spamtest +spamtestplus sieve_spamtest_status_type = text sieve_spamtest_status_header = X-Spam-Status sieve_spamtest_text_value1 = No sieve_spamtest_text_value10 = Yes } Example 3 --------- Spam header: `X-Spam-Score: sssssss' plugin { sieve_extensions = +spamtest +spamtestplus sieve_spamtest_status_header = X-Spam-Score sieve_spamtest_status_type = strlen sieve_spamtest_max_value = 5 } Example 4 --------- Spam header: `X-Spam-Score: status=3.2 required=5.0' Virus header: `X-Virus-Scan: Found to be clean.' plugin { sieve_extensions = +spamtest +spamtestplus +virustest sieve_spamtest_status_type = score sieve_spamtest_status_header = \ X-Spam-Score: score=(-?[[:digit:]]+\.[[:digit:]]).* sieve_spamtest_max_header = \ X-Spam-Score: score=-?[[:digit:]]+\.[[:digit:]] required=([[:digit:]]+\.[[:digit:]]) sieve_virustest_status_type = text sieve_virustest_status_header = X-Virus-Scan: Found to be (.+)\. sieve_virustest_text_value1 = clean sieve_virustest_text_value5 = infected }