By adding the SpamAssassin result string to the Subject line, users can determine whether they wish to read a message with a SpamAssassin score. For example:
Subject: [SPAM True ; 99.3 / 5.0] Free Money At Home with Prescription Xanirex!
Note that setting USE_CHECK to 0 returns the list of SpamAssassin tests that matched along with the verdict string (see 14.4.7 SpamAssassin Options in 14.4.7 SpamAssassin Options). This list can be very long, so it is best to set USE_CHECK to 1.
Specify the messages to be filtered.
Create the SpamAssassin configuration file.
This step is described in To File Spam to a Separate Folder. mode=1 specifies that the SpamAssassin result string is returned if the message is found to be spam.
host=127.0.0.1 port=2000 mode=1 debug=1
host and port specify the name of the system where spamd is running and the port on which spamd listens for incoming requests. mode=1 specifies that the SpamAssassin result string is returned if the message is spam. debug=1 turns on debugging in the SpamAssassin library.
Add the following lines to the option.dat file:
!for Spamassassin spamfilter1_config_file=/opt/SUNWmsgsr/config/spamassassin.opt spamfilter1_library=/opt/SUNWmsgsr/lib/libspamass.so spamfilter1_optional=1 spamfilter1_string_action=data:,addtag “[SPAM detected: $U]”;
As in previous examples, the first three options specify the SpamAssassin configuration file, shared library, and to continue MTA operation if there is a failure by the shared library. The following line
spamfilter1_string_action=data:,addtag “[SPAM detected $U]”;
specifies that a tag be added to the Subject: line. It has the literal prefix SPAM detected followed by the field string (default: Spam-Test) followed by “[result string]” returned by SpamAssassin. Because mode=1 was specified in 14.4.5 SpamAssassin Configuration Examples, the SpamAssassin result string is returned. Thus, a subject line looks something like this:
Subject: [SPAM detected Spam-Test: True ; 11.3 / 5.0] Make Money!
You can also use addheader and addtag together:
spamfilter1_string_action=data:,require ["addheader"];addtag "[SPAM detected $U]";addheader "Spamscore: $U";
to get a message like this:
Subject: [SPAM detected Spam-Test: True ; 12.3 / 5.0] Vigaro Now!Spamscore: Spam-Test: True ; 12.3 / 5.0
Set field= in spamassassin.opt to remove the default value of Spam-Test. A cleaner message is returned:
Subject: [SPAM True ; 91.3 / 5.0] Vigaro Now!Spamscore: True ; 91.3 / 5.0
Recompile the configuration, restart the server and start the spamd daemon.