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OME requires recipients to either sign in to an Office 365 account or confirm their identity via a single-use password, sent as a code to a mobile device or email account.

Whilst sending encrypted emails via OME is straightforward, your recipients will have a bit of work to do to access the message. You will need a valid subscription, however, which can set you back a pretty penny. With Office 365 Encryption, you won't need any certificates to send encrypted messages. All in all, S/MIME is probably only going to be used effectively by folks whose workplaces already have it set up.It's a lot of legwork, and to make matters worse, S/MIME can be rendered totally ineffective if an encryption key gets lost or falls into the wrong hands. S/MIME requires that you acquire a certificate to validate your identity and, of course, requires that your recipient have one, too. S/MIME encryption can be tricky to configure – namely because your intended recipient will need to be using an email service that supports S/MIME and have it set up and ready to rock. We'll take a brief look at each method below, then dive into some step-by-step setup guides later in the article. The recipient of your message will therefore require the private key that matches up with the public one – or else they won't be able to see what you've written!Ĭurrently, there are three ways to encrypt Outlook emails. Encryption requires the use of a set of keys – a public key (used to do the encrypting) and a private one (used for both encrypting and decrypting). When you encrypt an email, you're turning it into undecipherable ciphertext, whereas before it was plain text anybody could read. First thing's first, it's a good idea to get an idea of what encrypting an email actually entails.