From b120b7a856fd2f1bab21b1f03d10c469653b5695 Mon Sep 17 00:00:00 2001
From: makefu <root@pigstarter.de>
Date: Wed, 18 Jun 2014 14:40:22 +0200
Subject: add spamassassin

---
 content/posts/remote-spamassassin.rst | 77 +++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 content/posts/remote-spamassassin.rst

diff --git a/content/posts/remote-spamassassin.rst b/content/posts/remote-spamassassin.rst
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+++ b/content/posts/remote-spamassassin.rst
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+Using spamassassin on a remote IMAP Host
+##################################
+:date: 2014-04-15 14:20
+:tags: spamassassin, mutt,offlineimap,imapfilter
+
+
+I have the fortunate situation that i have hosted mail on a trusted second party (my father) so i do not have to deal with anything mail server related. I have a domain for receiving mails and i use a wildcard address to receive all the mails.
+
+Until now
+---------
+... I had the following setup:
+
+    1. Wherever i sign up with a mail address i use something like mailto://<service-domain>@<my-domain>
+    2. imapfilter_ pre-sorts mails based on the signup address
+    3. offlineimap_ retrieves new mails and puts them in my $HOME/Mail
+    4. mutt_ + msmtp_ to read and send mails
+
+Everything worked fine but my imapfilter list for spam grew above the 100 entries because some of my addresses were leaked by the web service i was using. Most spam mails got sorted correctly into my Spam folder but some survived the sorting.
+
+Spamassassin to the rescue
+--------------------------
+Everybody seems to be using spamassassin and i always thought it can only be used with procmail and real mail retrieval. Turns out isbg.py_ is what may solve all my spam problems. It logs into the imap host and filters new mails with the help of spamassassin.
+
+
+Installation and preparation:
+.. code-block:: bash
+   
+    #?/bin/sh
+    # install sa
+    aptitude install spamassassin pyzor
+    # enable SA, activate 'allow-tell'
+    sed -i -e 's#ENABLED=.*#ENABLED=1#' -e 's#OPTIONS=.*#OPTIONS="-4 --create-prefs --max-children 5 --helper-home-dir --allow-tell"#'  /etc/default/spamassassin
+
+    update-rc.d spamassassin enable
+    /etc/init.d/spamassassin start
+
+    # install IMAP spam begone
+    pip install isbg
+
+Configuration and learning:
+.. code-block:: bash
+   
+    #?/bin/sh
+    # configure SA to your liking
+    cat > $HOME/.spamassassin <<EOF
+    required_score          5.0
+    report_safe             0
+    use_bayes               1
+    bayes_auto_learn        1
+    skip_rbl_checks         0
+    use_razor2              1
+    use_dcc                 1
+    use_pyzor               1
+    ok_languages            en de
+    ok_locales              en de
+    score SUBJ_ILLEGAL_CHARS      0
+    EOF
+    /etc/init.d/spamassassin restart
+    
+    # make SA learn your spam folder via isbg,also save the password
+    isbg.py --imaphost <imap-domain> --ssl --imapuser <imap-username> --spaminbox INBOX.Spam --spamc --teachonly --learnspambox INBOX.Spam --savepw
+    
+    vim $HOME/.offlineimaprc
+    # change Presynchook = imapfilter to $HOME/bin/filter_mail
+
+    cat > $HOME/bin/filter_mail <<EOF
+    isbg.py --verbose --imaphost <imap-domain> --ssl --imapuser <imap-username> --spaminbox INBOX.Spam --delete --expunge --noninteractive  --spamc
+    imapfilter
+    EOF
+    # dont worry, --delete --expurge only deletes the messages from your inbox (and essentially moves them to your Spam folder)
+    
+    # create mutt macro to mark and move spam in your inbox
+    echo 'macro index,pager S "| sa-learn --spam\ns=INBOX.Spam\n\n" "file as Spam"' >> $HOME/.muttrc
+    # optional: disbale the 'press any key to continue' :
+    # echo 'set wait_key = no' >> $HOME/.muttrc
+
+After learning my >9000 spam mails in the spam folder the spamassassin bayes filter was trained pretty well. Now i was able to remove all the 'spam' rules from .imapfilter/config.lua, and it felt GREAT.
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