Skip to Content

Solved: How MIME tag works in Email filter?

The article describes how the MIME tag works for email traffic.


Config snip on FortiGate:

# config emailfilter profile
edit "default"
config imap
set action tag
set tag-msg "SpamByFGT:IMAP"
config pop3
set action tag
set tag-msg "SpamByFGT:POP3"

Below is an example of an email header tagged as spam over IMAP protocol.

Date: Mon, 19 Sep 2022 22:23:33 -0700
Subject: Proxy mode inspection issue
From: User2 <[email protected]>
To: [email protected]
Message-ID: <[email protected]>
MIME-Version: 1.0
Content-Type: text/html; charset=utf-8
SpamByFGT: =?utf-8?Q?IMAP?=
<p style="margin-block: 0px;">Proxy is not working</p>

Tag to MIME header does not modify the email contents[Subject/Body] directly for a user, rather the email client[Outlook/Thunderbird/etc] can take action based on this inserted Header/Attribute.



    Ads Blocker Image Powered by Code Help Pro

    Ads Blocker Detected!!!

    This site depends on revenue from ad impressions to survive. If you find this site valuable, please consider disabling your ad blocker.