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There are places in the internet, where you can get a free digital signature for email.

How can I use it with Gmail and Internet Explorer?

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Internet Explorer might not be the best choice to do that since it does not support extensions. – bastibe Feb 25 '10 at 16:16
Related: Digitally sign Gmail emails with S/MIME. – kenorb Oct 1 '14 at 17:15

I you use Firefox, you can use Firegpg (

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FireGPG has been discontinued on June 7, 2010. – kenorb Oct 1 '14 at 17:04

From the comments in this Gmail support forum thread, it looks like you may either have to use a desktop mail client (such as Outlook or Thunderbird), or use Firefox instead with extensions to allow certificates to be added to Gmail.

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Gmail S/MIME extension doesn't work anymore. – kenorb Oct 1 '14 at 17:05

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