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My boss just learned what malware is and decided he wants any emails that we receive from external (non-employee) senders to be marked in the body of the email. Something like the following:

[Followed by normal body of email]

Even though I think this is a silly response to the problem (and we have implemented better measures to protect ourselves), I promised I would investigate if this specific function is even possible with Kerio Connect.

So the question is, can I implement anything in Kerio that would add the custom text to the body of emails we receive? I see in message filtering where I can add custom headers or modify subjects, but I have not been able to figure out a way to modify the body of an email.

And if there are good reasons why this is a poor idea (like adding text to an HTML email without breaking the formatting of the original email), then please let me know those as well.


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No, Kerio does not have a feature that will allow you to modify the message body using specified rules. If you are using another MTA to relay mail to/from Kerio, you could use Mailscanner or something similar to do this.

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The modification of body is not possible for signed and/or encrypted messages. For the rest of messages, it can corrupt the formatting.

The Kerio Connect 9.x contains the new feature: server rules. With these filters (rules) you can modify subject, e.g. replace ${subject} with [External] ${subject} if the sender does not contain your domain name.
(WebAdmin -> Message Filters)

For more see http://kb.kerio.com/1831

[Updated on: Fri, 02 September 2016 14:53]

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