If you don't see the Options tab, you may need to open the message you're composing in its own window.
If you do not want to sign a message, from the Options tab of the mail message, click Sign so that it is not selected. To indicate signing, a lock icon with the text "This message will be digitally signed" will appear when you compose an email message: Click OK to save your changes and exit Outlook Preferences.īy default, your email messages will be digitally signed.IU does not currently use the "Certificate authentication" options if this is an option, do not set this.If you are using the classic Outlook interface, AES 256 is the best encryption algorithm. It is not necessary to check Encrypt outgoing messages each email message can be optionally encrypted when you compose it.In the "Encryption" section, select your certificate from the drop-down menu.Include my certificates in signed messages.Send digitally signed messages as clear text.For the best usability, enable the following options:.This section will not be available in the New Outlook interface. For "Signing algorithm", the default value of SHA-256 is appropriate for most situations.In the "Digital signing" section, select your certificate from the drop-down menu.If you are using New Outlook, click Security. If you are using the classic Outlook interface, click Advanced, and then select the Security tab. From the Outlook menu, select Preferences >Īccounts.If you have just installed your certificate on your Mac, close Outlook and then restart it.Use these instructions to enable Outlook to use client certificates to digitally sign and encrypt email. Use your certificate with Outlook for macOS If you do not have certificates for everyone to whom the message is addressed, you will be prompted to send the message unencrypted. If you have the public certificate for the user or users to whom the messages is addressed, you will be able to encrypt the email message: In the lower right of the message header, click the open lock icon to lock it when the icon is locked, your email message will be encrypted. You may not want to sign messages to mailing lists, because S/MIME digital signatures are attachments, which some lists do not accept. If the "Signed" icon has an x instead, your message will not be signed. To send a signed message, verify that the "Signed" icon has a checkmark ( ✔) in it. If you don't see the "Signed" icon, select Customize (in the lower left of the message header), and add the "Lock" and "Signed" icons. You should see the "Signed" icon ( ) in the lower right of the message header (this indicates the message will be signed).
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