Digitally signed messages can be sent to anyone. If none of the intended recipients has a certificate, Outlook on the web won't let you send the message in encrypted form.Ī digitally signed message reassures the recipient that the message hasn't been tampered with and verifies the identity of the sender. If at least one recipient of an encrypted message has a certificate, Outlook on the web will send the message to all recipients. If you try to send an encrypted message to a recipient who doesn't have a certificate, Outlook on the web will warn you that the recipient can’t decrypt S/MIME encrypted messages. Depending on the email client they’re using, they may or may not see and be able to verify the digital signature.Įncrypted messages can be read only by intended recipients who have a certificate. If you send a digitally signed message to a recipient outside your organization, they will be able to read the message. Recipients can only verify the digital signature if they’re using an email client that supports S/MIME and have installed the S/MIME control. S/MIME digital signatures are only fully supported for recipients inside your organization. If you send an encrypted message to someone outside your organization, they won't be able to decrypt and read the message. ![]() S/MIME message encryption is supported only on messages sent to and from recipients in your organization’s address list. Internet Explorer 11 or one of the three most recent versions of Edge or Chrome is required to send and receive encrypted messages, digitally sign messages that you send, and to verify digital signatures on messages that you receive. Check with your IT administrator if that doesn't work. The domain is usually the part after the sign in your email address. Select the link to go to the settings page, and allow your work or school domain to use S/MIME. You can add it in S/MIME Extension options page in the settings for your browser. S/MIME isn't configured to work with the current domain. If you select No, the domain won't have access to S/MIME.Įdge and Chrome: You might see the following message the first time you try to use S/MIME in Outlook on the web on Edge or Chrome after you install the S/MIME extension: If you select Yes, you won't be prompted again for this domain. Internet Explorer: You might see the following message when you open Outlook on the web in Internet Explorer for the first time after you install the S/MIME control update:ĭo you want to allow the domain to use the S/MIME control to encrypt and decrypt messages in your inbox? Only allow domains that you trust. Select Run to continue the installation.Īllow the Outlook on the web domain to use the S/MIME control You might be prompted again to verify that you want to run the software. When you’re prompted to run or save the file, select Run or Open (the choice will vary depending on the web browser you're using). ![]() Instructions for IT administrators can be found in Configure S/MIME settings in Exchange Online for Outlook on the web. Check with your IT administrator or helpdesk to confirm that your computer is joined to a domain and has the required policy. He's been gaming since the Atari 2600 days and still struggles to comprehend the fact he can play console quality titles on his pocket computer.Note: To use S/MIME on Chrome, your computer must be joined to a Microsoft Active Directory domain and have a Chrome policy to include the S/MIME extension. Oliver also covers mobile gaming for iMore, with Apple Arcade a particular focus. Current expertise includes iOS, macOS, streaming services, and pretty much anything that has a battery or plugs into a wall. Since then he's seen the growth of the smartphone world, backed by iPhone, and new product categories come and go. Having grown up using PCs and spending far too much money on graphics card and flashy RAM, Oliver switched to the Mac with a G5 iMac and hasn't looked back. At iMore, Oliver is involved in daily news coverage and, not being short of opinions, has been known to 'explain' those thoughts in more detail, too. ![]() ![]() He has also been published in print for Macworld, including cover stories. Oliver Haslam has written about Apple and the wider technology business for more than a decade with bylines on How-To Geek, PC Mag, iDownloadBlog, and many more.
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