Exim – delete specific emails from queue

Sometimes your exim mail queue can grow quite large. Especially when some website (WordPress!) is hacked and is sending tons of spam mail. Or when you end up with thousands of frozen mails. You probably don’t want to remove all emails from queue. That would mean legit emails too. You want to specify and delete only specific ones.

For sake of this demonstration we want to delete all emails that contains string domain.com

18h   60K 1b33Uz-000LkN-48 <info@domain.com> (someuser)
          info@somedomain.com

Just run command below and all mails with string match doman.com will be deleted from mail queue.

exim -bp |  grep "domain.com" | awk {'print $3'} | xargs exim -Mrm

Or for example, in case of frozen mails:

exim -bp |  grep froz | awk {'print $3'} | xargs exim -Mrm

Directadmin – enable and configure Spamassassin automatically when adding user

By default, when you add new user in Directadmin, Spamassassin is disabled. Some users may not know about Spamassassin, so they’ll have it disabled and will receiving a lot of spam. So it may be good practice to enable Spamassassin by default. You can do that by adding below code in your /usr/local/directadmin/scripts/custom/user_create_post.sh script. The first step is well described on Directadmin sites. But you may also want to define some parameters for Spamassassin “on the fly”. You can do that by manipulating filter.conf file.
In this example I want that on user creation:

  1. spam goes to appropriate users spam folder,
  2. I don’t want to delete high scoring spam,
  3. I want to rewrite subject of spam email with *****SPAM*****.

Just add below code in your user_create_post.sh script. And remove script comments (##).

## We enable Spamassassin, create needed files and give them appropriate permissions
if [ “$spam” = “ON” ]; then
DIR=/home/$username/.spamassassin
mkdir $DIR
touch $DIR/user_prefs
chown ${username}:mail $DIR
chmod 771 $DIR
chown $username:$username $DIR/user_prefs
chmod 755 $DIR/user_prefs
touch $DIR/spam
chown mail:$username $DIR/spam
chmod 660 $DIR/spam

## Here we define some variables for Spamassassin by adding some lines to filter.conf
echo “high_score=15” >> /etc/virtual/$domain/filter.conf
echo “high_score_block=no” >> /etc/virtual/$domain/filter.conf
echo “where=userspamfolder” >> /etc/virtual/$domain/filter.conf
echo “rewrite_header subject *****SPAM*****” >> /home/$username/.spamassassin/user_prefs

## Adding operation in task queue
echo “action=rewrite&value=filter&user=$username” >> /usr/local/directadmin/data/task.queue
fi
exit 0;

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