Encrypt Messages By Using S Mime In. Select Encrypt contents and attachment of all messages I send to automatically encrypt all outgoing messages. Optional Select Always sign with SMIME Always encrypt with SMIME or both to automatically digitally sign or encrypt all outgoing messages.
SMIME E-Mail Security SMIME lets you encrypt and digitally sign e-mail messages you send view encrypted content in messages you receive and verify senders digital signatures. In the Trust Center window that opens open the Email Security tab in the left pane. SMIME in Outlook for iOS and Android is supported with Microsoft 365 or Office 365 accounts using the native Microsoft sync technology.
S MIME is used to support enhanced encryption in transit and automatically encrypts your outgoing emails if it can.
However as the issue is related to reading encrypted messages. Finish composing your message and then click Send. In the email message choose Options select Encrypt and pick Encrypt with the SMIME option from the drop-down. This computer has the most recent version of the SMIME control installed.