How to digitally sign an email

Mohd Arif 921 Reputation points
2022-01-28T10:48:37.2+00:00

We have M365 subscription. To enhance mail security, we are planning to add a digital signature to mail. So anyone would send email, it will be digitally signed using user or computer certificate to claim the ID of sender that is from a genuine user, not an imposter. How can we do it? appreciate your help.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,335 questions
Microsoft 365 Publishing
Microsoft 365 Publishing
Microsoft 365: Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line. Publishing: The process of preparing, producing, and releasing content for distribution or sale.
595 questions
Windows Server Security
Windows Server Security
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
1,717 questions
0 comments

3 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Vadims Podāns 8,866 Reputation points MVP
    2022-01-28T12:24:17.49+00:00
    0 comments
  2. Aaron Xue-MSFT 2,581 Reputation points Microsoft Vendor
    2022-01-31T01:45:27.103+00:00

    Hi @Mohd Arif ,

    Agree with crypt32.

    You need to install the S/MIME before you sign the message.

    I have done some research, here’s an article for you reference.
    https://www.howtogeek.com/665438/how-to-digitally-sign-or-encrypt-emails-in-outlook-online/

    Please Note: Since the web sites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.

    If the response is helpful, please click "Accept Answer" and upvote it.

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

  3. Limitless Technology 39,336 Reputation points
    2022-01-31T09:47:27.097+00:00

    Hi there,

    -On the File tab, click Options >Trust Center.
    -Under Microsoft Outlook Trust Center, click Trust Center Settings.
    -On the Email Security tab, under Encrypted Mail, select the Add digital signature to outgoing messages check box.

    Here is a link for a detailed description of the process that you must follow.

    Secure messages by using a digital signature
    https://support.microsoft.com/en-us/office/secure-messages-by-using-a-digital-signature-549ca2f1-a68f-4366-85fa-b3f4b5856fc6

    --If the reply is helpful, please Upvote and Accept it as an answer--

    0 comments