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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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