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This varies by the mail client that you are using, though every mail client will do it similarly. In general, they will all put some indicator in or around the header of the mail message to indicate that the message has been digitally signed and that the signature is valid or invalid.
Various mail clients:
Other mail clients also allow you to verify the signature but it is slightly different for each one. Please contact your DivRep or the IT Help Desk to learn how to verify this signature in your mail client.
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Currently there is no way to verify a digital signature in Google Mail. Please use Webmail or real mail client to verify the authenticity of the digitally signed messages. We are investigating options with Gmail.
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In Webmail, the digital signature is indicated in the body of the message by the Pad Lock, the word Signed and the yellow box below it.
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In iOS Mail, the digital signature is indicated by the presence of the check mark beside the From address.
If you click on the From address , you can get more information about the digital signature.
And then clicking on verify certificate will show you this:
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In Thunderbird for Windows mail, the digital signature is indicated by the presence of an envelope icon with a red seal beside the Date stamp.
Click on the envelope icon to display the certificate message.