This message has been digitally signed and encrypted by the sender. Signed e-mail from others allows you to verify the authenticity ...

This message has been digitally signed and encrypted by the sender. 

Signed e-mail from others allows you to verify the authenticity of a message -- that the message is from the supposed sender and that it has not been tampered with during transit.

Any problems with a signed message will be described in a Security Warning which may follow this one. If there are problems, you should consider that the message was tampered with or was not from the supposed sender.

When you receive an encrypted e-mail message, you can be reasonably confident that the message was not read by anyone else. Outlook Express automatically decrypts e-mail messages, provided you have the correct digital ID installed on your computer.
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