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I just wonder if there is a way to use SSL certificates or PGP keys for signing my email.

At the moment I have to setup S/MIME in Outlook (or another thick client) to send signed messages via SMTP. It works for me, but I'm looking for a way to do the same using GMail's web interface.

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up vote 2 down vote accepted

FireGPG can use GnuPG, but I couldn't find any mention of S/MIME.

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Gmail S/MIME plugin for firefox.

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