[BlueOnyx:02563] Re: adding a standard disclaimer to all emails?

[Michael Stauber]

Hi Kristian,

> Besides, it adds the BlueOnyx-signature at the bottom of every mail so
> if it would support S/MIME the signature would be red in Outlook and a
> broken pen in Thunderbird, as the mail would have been altered since I
> sent it. Exactly what the topic poster wants to do.

Not quite, but almost. :o)

When I look at your signed message on the list (in Kmail), then it shows your 
message body in a yellow block that starts with ...

*** Not enough information to check the signature (Details) ***

... Your message ....

*** End of signed message ***

Then right after that comes the footer that the list added.

So although your message has been altered (by adding the list footer!), the 
signed section of the message body itself has not been changed.

If I had your key in my key ring, then even the attachment of the list footer 
wouldn't break the signing of the message and the message would check out.

I know that from a couple of other lists where people (whose keys I have in my 
keyring) sign their messages, too.

This works because a signed message is usually a multipart mime message. Yours 
for example consisted of the following parts:

Text - multipart/signed
	- Internal part (simple text - 7bit) 	<-- Your message body
	- S/MIME Cryptographic Signature 	<-- Signature
	- Text (simple)                                      	<-- list footer

So adding the list footer doesn't break the signature.

But yeah, I'd almost bet money on the fact that MailScanner would mess this up 
and would break the signature. So I entirely agree with you: If my ISP would  
add a footer to all my messages, then I'd also quit services with him in a 
heartbeat.

-- 
With best regards

Michael Stauber