New answers tagged certificate
The mail can only be encrypted as long as the recipient als uses S/MIME encryption and the mail client knows the recipient's public key. As long as you do not meet that requirements, your mail will be signed, will include a public key, but will not be encrypted.
You should be able to view and remove certificates or S/Mime if you go to: Mail, Contacts and Calender Go to your mail account Click advanced Uncheck S/Mime or remove the certificate Please also check out this Official Apple Guide By clicking the name in the Mail.App you should be able to revoke the certificate. Check this image:
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