Exchange Webmail 2010 and OpenPGP Signed mail

This entry was posted by on Tuesday, 20 March, 2012 at

I am a long-time user of OpenPGP to digitally sign my email. I am aware of the fact that most mail clients do not support this by default (but installing the EnigMail addon in Thunderbird couldn’t be easier).

Most mail clients simply show the mail, with my signature as attachment. No hurt done, they can still read my email message. Now, microSoft Exchange Webmail 2010 has a new feature and gives the following error:

“This message has a digital signature. The digital signature couldn’t be validated because the S/MIME control isn’t available.”

And decides this is a reason to not show the contents of the email. PANIC!

But have no fear, there’s yet another typical microsoft feature here: click “Reply” and you’ll see the contents of the email as quoted text.

They never seize to amaze me.

Why sign email you wonder? Read this article.

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