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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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