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+====== Scanning User Mailboxes for Spam and Training the Bayes Filter ======
+The script below requires a mail transfer agent such as Dovcot that is set up to place mailboxes under the user's home directories in ''/home''. Upon referencing this script from crontab, it will periodically scan all user mailboxes for the ''Junk'' folder and then automatically train the Spamassassin bayes filter.
+<file bash sa-learn-junk-folders.sh>
+#!/bin/sh
+###########################################################################
+##  Copyright (C) Wizardry and Steamworks 2017 - License: GNU GPLv3      ##
+###########################################################################
+# A script to make amavis / spamassassin learn spam mail through bayes    #
+# from all the mailboxes present on the system.                           #
+#                                                                         #
+# For this script to work, a mail-server must be configured by enabling   #
+# IMAP mailboxes stored in the user's home directory, users should have a #
+# virtual mailbox "Junk" created into which they can place spam E-Mails.  #
+# After that, you can configure the script and reference it in crontab.   #
+###########################################################################
+###########################################################################
+#                             CONFIGURATION                               #
+###########################################################################
+# The name of the Junk folder - under Dovecot, this is commonly "Junk"
+JUNK_FOLDER="Junk"
+# The path to the spamassassin database.
+SPAMASSASSIN_DATABASE="/var/lib/amavis/.spamassassin"
+# The mailbox type can be either: Maildir, mail or sdbox
+MAILBOX_TYPE="sdbox"
+###########################################################################
+#                                INTERNALS                                #
+###########################################################################
+# Train spam from junk folder.
+for i in `find /home/*/$MAILBOX_TYPE/ -type d -name "$JUNK_FOLDER"`; do
+    HOME_FOLDER=`echo $i | awk -F"/" '{ print $3 }'`
+    sa-learn --use-ignores \
+        --dbpath "$SPAMASSASSIN_DATABASE" \
+        -p "/home/$HOME_FOLDER/.spamassassin/user_prefs" \
+        --spam "$i" > /dev/null 2>&1
+done
+# Sync databases
+sa-learn --dbpath "$SPAMASSASSIN_DATABASE" --sync > /dev/null 2>&1
+</file>