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diff --git a/Administrator_Guide/en-US/Combating_Spam.xml b/Administrator_Guide/en-US/Combating_Spam.xml index 81e3225..ea5dacf 100644 --- a/Administrator_Guide/en-US/Combating_Spam.xml +++ b/Administrator_Guide/en-US/Combating_Spam.xml @@ -567,6 +567,158 @@ bayes_sql_override_username root</screen> </section> + <section id="sect-Administrator_Guide-Combating_Spam-Default_Amavisd_Behaviour"> + <title>Default Amavisd Behaviour</title> + <para> + The default behaviour shown in a Kolab Groupware deployment depends on the default settings that come with the packages delivered mostly through native, distribution-specific software repositories. This chapter documents various aspects of the behaviour Kolab Groupware will show referring to the appropriate settings that will allow a system administrator to modify the behaviour. + </para> + <formalpara id="form-Administrator_Guide-Default_Amavisd_Behaviour-Adding_Spam_Information_Headers"> + <title>Adding Spam Information Headers</title> + <para> + Amavisd, by default, adds spam information headers only to messages that; + </para> + + </formalpara> + <para> + <orderedlist> + <listitem> + <para> + Are intended for delivery to recipients in local domain name spaces, + </para> + <para> + The list of local domain name spaces Amavisd uses is configured using any of the following settings in <filename>/etc/amavisd/amavisd.conf</filename>: + </para> + <para> + <itemizedlist> + <listitem> + <para> + <literal>@local_domains</literal>, + </para> + + </listitem> + <listitem> + <para> + <literal>@local_domains_acl</literal>, + </para> + + </listitem> + <listitem> + <para> + <literal>read_hash(\%local_domains)</literal> + </para> + + </listitem> + + </itemizedlist> + + </para> + + </listitem> + <listitem> + <para> + Get a spam score over <literal>2.0</literal> from <application>SpamAssassin</application>. + </para> + <para> + The related setting is <literal>$sa_tag_level_deflt</literal> in <filename>/etc/amavisd/amavisd.conf</filename>. + </para> + + </listitem> + + </orderedlist> + + </para> + <formalpara id="form-Administrator_Guide-Default_Amavisd_Behaviour-Spam_Kill_Level"> + <title>Spam Kill Level</title> + <para> + The spam kill level controls which score spam must have been marked with before Amavisd considers the message to not be delivered to the intended recipient(s). + </para> + + </formalpara> + <para> + Depending on your platform, the default for this score is <literal>6.31</literal> or <literal>6.9</literal>. When a message is marked with a spam score higher than or equal to this level, Amavisd will take "evasive action". See <xref linkend="sect-Administrator_Guide-Default_Amavisd_Behaviour-Configuring_Evasive_Action" /> for more information on configuring evasive actions. + </para> + <section id="sect-Administrator_Guide-Default_Amavisd_Behaviour-Configuring_Evasive_Action"> + <title>Configuring Evasive Action</title> + <para> + You can control what "evasive action" Amavisd takes using the <literal>$final_spam_destiny</literal> and <literal>$final_virus_destiny</literal> settings in <filename>/etc/amavisd/amavisd.conf</filename>. The default is usually to discard the message, but the following options are available: + </para> + <para> + <itemizedlist> + <listitem> + <formalpara id="form-Administrator_Guide-Configuring_Evasive_Action-D_PASS"> + <title>D_PASS</title> + <para> + The message is accepted for delivery to the intended recipient(s), despite having been scored passed the kill or cutoff level, and regardless of bad content. + </para> + + </formalpara> + <para> + If a quarantine address has been configured, the quarantine address will receive a copy of the email. See <xref linkend="form-Administrator_Guide-Configuring_Evasive_Action-Configuring_Quarantine" /> to learn how to configure the quarantine address. + </para> + + </listitem> + <listitem> + <formalpara id="form-Administrator_Guide-Configuring_Evasive_Action-D_BOUNCE"> + <title>D_BOUNCE</title> + <para> + The message is not accepted for delivery to the intended recipient(s). A Delivery Status Notification stating delivery failure is sent out to the sender. + </para> + + </formalpara> + <para> + If a quarantine address has been configured, the quarantine address will receive a copy of the email. See <xref linkend="form-Administrator_Guide-Configuring_Evasive_Action-Configuring_Quarantine" /> to learn how to configure the quarantine address. + </para> + + </listitem> + <listitem> + <formalpara id="form-Administrator_Guide-Configuring_Evasive_Action-D_REJECT"> + <title>D_REJECT</title> + <para> + The message is rejected by Amavisd, and while Amavisd sends out a 550 SMTP response to the Mail Transfer Agent, said Mail Transfer Agent is responsible for sending out the Delivery Status Notification, if any. + </para> + + </formalpara> + <para> + If a quarantine address has been configured, the quarantine address will receive a copy of the email. See <xref linkend="form-Administrator_Guide-Configuring_Evasive_Action-Configuring_Quarantine" /> to learn how to configure the quarantine address. + </para> + + </listitem> + <listitem> + <formalpara id="form-Administrator_Guide-Configuring_Evasive_Action-D_DISCARD"> + <title>D_DISCARD</title> + <para> + The message is simply discarded by Amavisd. The sending Mail Transfer Agent will receive a positive SMTP delivery response, and Amavisd sends out no Delivery Status Notification, nor does it forward the message for delivery to the intended recipients. + </para> + + </formalpara> + <para> + If a quarantine address has been configured, the quarantine address will receive a copy of the email. See <xref linkend="form-Administrator_Guide-Configuring_Evasive_Action-Configuring_Quarantine" /> to learn how to configure the quarantine address. + </para> + + </listitem> + + </itemizedlist> + + </para> + <formalpara id="form-Administrator_Guide-Configuring_Evasive_Action-Configuring_Quarantine"> + <title>Configuring Quarantine</title> + <para> + Two separate quarantine forwarding addresses can be configured. One is for messages labeled as spam, another for messages suspected to contain a virus. + </para> + + </formalpara> + <para> + A catchall address for spam can be configured by setting the <literal>$spam_quarantine_to</literal> setting to a valid recipient address in <filename>/etc/amavisd/amavisd.conf</filename> + </para> + <para> + A catchall address for messages suspected of containing a virus can be configured by setting the <literal>$virus_quarantine_to</literal> setting to a valid recipient address in <filename>/etc/amavisd/amavisd.conf</filename>. + </para> + + </section> + + + </section> + </chapter> |