External Tag In Mail

["KADAM, SIDDHESH" <si...@netcore.co.in>]

Hi Guys,

Using Spamassassin can we add word *EXTERNAL *in body of the email when 
it comes from external world.

Thanks In Advanced.
Siddhesh

Re: External Tag In Mail

[Bill Cole <sa...@billmail.scconsult.com>]

On 2 Aug 2019, at 8:15, KADAM, SIDDHESH wrote:

> Hi Guys,
>
> Using Spamassassin can we add word *EXTERNAL *in body of the email 
> when it comes from external world.

No. SpamAssassin does not do general-purpose body modification. The only 
body modification it will do is in the case when report_safe is set and 
the original message is encapsulated in a new report message.

Beyond that, the concept is fundamentally hostile to email 
authentication. Modifying the message body invalidates any form of 
signature (e.g. DKIM, PGP, or S/MIME.) As a result, delivered messages 
which have been signed may be displayed by mail clients with indications 
that they are fraudulent. It is also non-trivial to modify the bodies of 
modern mail, since so much of it is composed in MIME 
"multipart/alternative" form, making it necessary to modify both the 
plaintext part and the HTML part.

If you really want to do this, one tool that could be useful in doing it 
safely (by encapsulating the original message rather than modifying it) 
is the MIMEDefang milter, which has very strong support for manipulating 
MIOME messages. To use it, you need a MTA that supports the Milter 
interface and you need some capacity to write Perl code.

-- 
Bill Cole
bill@scconsult.com or billcole@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)