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Email Disclaimers and Digital Signatures

David Scott, MCSE
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Last Modified: 2010-08-05
I am currently using GFI mail essentials to add a disclaimer to all outgoing messages.  Exchange 2003, Outlook 2003.

We also use digital ids to sign our email.  

The disclaimers invalidate the digital signatures because the disclaimer is added to the email after it is signed.  

Recipients see a warning about the digital id being invalid making it appear worse than no signature.

My question: Is there a way to have a disclaimer added without it invalidating the digital signature?

Note: I don't want to have to have people add it to their own email signatures (name,title,phone#,etc)

I've seen info on event sinks but have seen that they don't work well.  

I've also tried exclaimer mail utilities but same result.

If it were up to me I'd just use the digital signatures and not the disclaimer but I'm not a lawyer so perhaps its best its not up to me.
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CERTIFIED EXPERT
Top Expert 2008
Commented:
I just had this show up on my server, now that I am playing with signatures.

The answer is no.  Anything that tries to modify the message after it has left will break the signature.  It is by design, and the solution is to bring the signature inside to Outlook.

Kieran
David Scott, MCSENetwork Administrator

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Commented:
I was afraid of that.  ARGH!  Thanks!

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