Append to all emails

Is it possible to append a specific set of text to each email? I don’t mean just editing an arbitrary template, I mean append to every email sent from the system.

If this would require a plug-in, is there a way to catch all emails and edit before sending?

You could do it for digest emails.

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So this would apply when say a user gets an email for a topic reply?

Basically I need to append a custom header (an IMG) into the emails.