If you save the changes, the message will no longer be digitally signed – Outlook 2007
Thu, Aug 20, 2009Some users receive this message, even though they’ve made no change to the message:
If you save the changes, the message will no longer be digitally signed – Outlook 2007
… while reading digitally signed messages.
This can sometimes be related to an Anti-Virus setting that scans email content and then certifies the message, adding a tag similar to this:
No virus found in this incoming message.
Checked by AntiVirus – www.whateveryouravswebsiteis.com
Version: 8.8 / Virus Database: 880.00.00/8800 – Release Date: 08/08/08