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 is not 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 the new interface, click Security.

If you are using the classic Outlook interface, click Advanced, and then select the Security tab.

From the Outlook menu, select Preferences > Accounts, and then select your IU email account.

If you just installed your client certificate, close Outlook, and then restart it.

Use these instructions to enable Outlook to use client certificates for digitally signing and/or encrypting email Enable digital signing and encryption Use your client 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.

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. If you have the public certificate for the recipient(s) to whom the message is addressed, you will be able to encrypt the email message. Because digital signatures are sent as attachments, which some mailing lists do not accept, you may not want to digitally sign messages sent to mailing lists.

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