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Remove “EXTERNAL” Tag from Exim Emails

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In an earlier post I mentioned how to tag/add EXTERNAL to the subject header on exim.  I made the changes on our Sophos UTM which may require re-applying the configuration files after Sophos UTM update. I ended up adding and elif block to act on outgoing emails in the exim.system_filter file this is the block I added.  Change your domain as appropriate and add additional lines if you need to. elif  $header_from: contains "@yourdomain.com>"  and $header_to: does not contain "@yourdomain.com>"  and $header_subject: contains "[EXTERNAL]" then  headers add "Old-Subject: $h_subject:"  headers remove "Subject"  headers add "Subject: ${sg{$h_old-subject:}{[[]EXTERNAL[]]}{}}"  headers remove "Old-Subject" endif This is the full exim.system_filter file To have the $h_from or $header_from act on the domain part and not the display name part if someone was trying to spoof the from name I added the > at the ...
Location: Houston, TX, USA
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Rewrite Subject Lines in Exim Email Server

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for incoming email not from our domain (external domains) we want to add [EXTERNAL] to the subject but if it already contains [EXTERNAL] we do not want to add it again. I made the changes on our Sophos UTM 9 system.  More than likely it will require rewriting these files after a update.  This should apply to other systems running exim. If your exim is installed in chroot enviroment you want to place the files there on Sophos UTM this is /var/chroot-smtp/etc/ on system with non chroot it may be /etc/exim/ created a file /var/chroot-smtp/etc/exim.system_filter with following contents change domains to match your enviroment.  The > placed on the end of the match sstring so it does not match email address spoofing in display name using your domain.  /var/chroot-smtp/etc/exim.system_filter if $header_from: does not contain "@yourdomain.com>" and $header_from: does not contain "@yourdomain.localdomain>" and $header_from: does not contain ...
Location: Houston, TX, USA
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