Digitally sign internal emails using PKI


Can we use our internal Windows PKI to digitally sign internal emails sent via Outlook 2013 (Office 365)? what is involved and is there a document describing the necessary steps?

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Dave HoweSoftware and Hardware EngineerCommented:
1) issue a webserver style certificate for the user doing the signing; exchange can automatically handle that for you; see this for an example
2) note that the compose window now has sign and encrypt buttons - hit sign :D

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rookie_bAuthor Commented:
Thanks Dave,

This seems to be the right direction. I can see "Exchange Signature Only" and "User Signature Only". Should I  use one of these templates instead of the webserver one? Will the Exchange one work for our hosted Office 365 Exchange?

Dave HoweSoftware and Hardware EngineerCommented:
MS CA Template you want is probably called "User" - assuming you want the full functionality. Signature only keys, as the name implies, can only be used to sign messages; full user certs can also be used for email encryption.
rookie_bAuthor Commented:
Dave HoweSoftware and Hardware EngineerCommented:
You are welcome - awesome to see someone actually using this; for a built in option to almost all email software, it is shockingly underused...
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