Adding an ‘External’ Warning to Email Bodies in Proxmox Mail Gateway: A Simple Guide

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If you want to add external warning on email subject, please read this one: Proxmox Mail Gateway : How to add “EXTERNAL” warning on email subject

ATTENTION: If you have a disclaimer on your PMG added in the footer, your disclaimer will be added in the header if you follow this guide

In this article, I am going to describe how to add external warning in the body of the email. This warning usually appears on the first line before the actual content

– Go to PMG Dashboard -> Mail Filter -> Action Objects
– Click Add and select Disclaimer
– Add information to the Name and Comment
– Fill in the Disclaimer column with the following lines

<div style="background-color: #ffeb9c; width: 100%; padding: 2pt; font-size: 10pt; line-height: 12pt; font-family: 'Calibri'; color: black; text-align: left; border: 1pt solid #9C6500;"><span style="color: #9c6500;">CAUTION:</span> This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender <span style="color: ##ff0000;">__SENDER__</span> and know the content is safe.</div>

– Go to PMG Dashboard -> Mail Filter – Click Add Rules
– Add information to the Name
– Fill 99 in the Priority
– Select in on Direction section
– Tick on the Active section

– Select Action Objects that has been created from Available Objects -> Action

Backup file

cd /usr/share/perl5/PMG/RuleDB

Download new file.

curl -k > /usr/share/perl5/PMG/RuleDB/

Restart pmg-smtp-filter

systemctl restart pmg-smtp-filter

Now, you can see the warning in the email body when receiving emails from the internet

Example of text mode email
Example of html mode email

Source html email template:

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Good Luck 🙂


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