https:\/\/tech.saqr.org\/2020\/01\/for-incoming-email-not-from-our-domain.html<\/a><\/p>\n\n\n\n
\u2139\ufe0fExim filters do not appear to allow you to manipulate the body of an email, to do that you would need to use something like altermime<\/a>.<\/em><\/p>\n\n\n\n Steps<\/strong><\/p>\n\n\n\n SSH to the server and create a Exim filter. In cPanel there are in Change “incredigeek.com” to your domain name. Save the file.<\/p>\n\n\n\n You can replace Now log into WHM, go to Service Configuration > Exim Configuration Manager > Basic Editor > Filters<\/p>\n\n\n\n At the bottom of the filters, you should see a new “Custom Filter: external_email_filter” There you go! Any email you receive now that is from an external domain should now have “[External]”, or whatever you specified, prepended to the subject. <\/p>\n\n\n\n If you run into any errors, try reviewing the panic log to see if there are any syntax errors.<\/p>\n\n\n\n You can use tail to follow the panic log to verify you have all the syntax correct.<\/p>\n\n\n\n <\/p>\n\n\n\n How to Customize the Exim System Filter File. Exim Filter Files. Manage custom, server-wide Exim filters in cPanel. In this post we are going to setup Exim to add “[External]” to the email subject if it originates from outside of the domain. Thanks to Sam for this post. It was extremely helpful.https:\/\/tech.saqr.org\/2020\/01\/for-incoming-email-not-from-our-domain.html \u2139\ufe0fExim filters do not appear to … Continue reading \n
Create an Exim Filter<\/h2>\n\n\n\n
\/usr\/local\/cpanel\/etc\/exim\/sysfilter\/options\/<\/code>. You can name the filter what ever you want. <\/p>\n\n\n\nvi \/usr\/local\/cpanel\/etc\/exim\/sysfilter\/options\/external_email_warning<\/code><\/pre>\n\n\n\n
You can also change “[External]” to whatever you want to be prepended to the subject.<\/p>\n\n\n\nif\n $header_to: contains \"@incredigeek.com>\"\n and $sender_address: does not contain \"@incredigeek.com>\"\n and $header_subject: does not contain \"[External]\"\nthen\n headers add \"Old-Subject: $h_subject:\"\n headers remove \"Subject\"\n headers add \"Subject: [External] $h_old-subject\"\n headers remove \"Old-Subject\"\nendif<\/code><\/pre>\n\n\n\n$sender_address<\/code> with $header_from<\/code>. While both can technically be forged, sender_address<\/code> refers to the envelope sender provided by the SMTP MAIL FROM command and is harder to spoof if SPF is set up. header_from<\/code> can be spoofed by just about any email client by change the from name.<\/p>\n\n\n\nEnable Custom Exim Filter<\/h2>\n\n\n\n
This is the filter you just created. Make sure it is On, and Save<\/strong> changes.<\/p>\n\n\n\n![\"Enable](\"https:\/\/www.incredigeek.com\/home\/wp-content\/uploads\/2024\/12\/image.png\")
<\/a><\/figure>\n\n\n\nTroubleshooting<\/h2>\n\n\n\n
tail \/var\/log\/exim_paniclog -f<\/code><\/pre>\n\n\n\nMore Information and Links<\/h2>\n\n\n\n
https:\/\/docs.cpanel.net\/knowledge-base\/email\/how-to-customize-the-exim-system-filter-file<\/a><\/p>\n\n\n\n
https:\/\/www.exim.org\/exim-html-current\/doc\/html\/spec_html\/filter_ch-exim_filter_files.html<\/a><\/p>\n\n\n\n
https:\/\/support.cpanel.net\/hc\/en-us\/articles\/4402464439447-How-to-manage-custom-server-wide-Exim-filters-in-cPanel-and-how-to-quickly-enable-and-disable-them-in-the-WHM-UI<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"