Configure Outlook (to sign automatically)
You can configure Outlook to send digitally signed and/or encrypted e-mails.
These instructions were created using Outlook 2016 on Windows 10 (Latest update 23.04.2020). |
Please note: You should install your user (S/MIME or X.509) certificate in the certificate store of your Windows system before you begin the configuration of Outlook. If you have used a browser other than the Internet Explorer when applying for the certificate, you should first export your user certificate and the RSA keypair into a .p12 file and then import this into your Windows certificate store. If you do not own a certificate, you can apply for one at the DFN-PKI website. For more information please visit "Applying for User Certificate". |
Configure Outlook to digitally sign outgoing e-mails
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Choose stronger signature and encryption algorithms
![]() | Please note: If you want to add a user certificate for another mail address, you can di it using the button "New" ("Neu"). By clicking this button you empty all the fields and can add a new security setting. |
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Send a digitally signed e-mail (optional)
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Verify the digital signature on a signed e-mail
![]() | Click on the signature icon. Note: a digital signature is not the footer Outlook allows you to append at the end of each e-mail (e.g. Name, Department, Address, Phone, etc). A digitally signed e-mail (and the corresponding digital signature) is based on cryptographic algorithms and allows the recipient of your e-mail to:
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![]() | If you click on "Details" you get to see more crypto stuff, e.g. message hash value. We choose to stay under "Allgemein" and have a closer look at the sender's user certificate. |
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![]() | This is the certificate chain:
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For more information: