![]() Mail indicates valid signatures with a blue checkmark to the right of the sender's address. Untrusted signatures have a red question mark to the right of the sender's address. In a signed message from your intended recipient, tap the sender's address. If the intended recipient's signature is untrusted, use these steps to install the recipient's certificate on the device: If you aren't using an Exchange account, or if your recipient isn't in the same organization, you need to send and receive signed emails before you send an encrypted message. You'll see the Lock button in the address field when you compose a message, and your recipient will be able to decrypt it. If your recipient is a user in the same Exchange environment, iOS can find the necessary certificate for message encryption. ![]() You can also use the blue Lock button in the address field to change the encryption state of an outgoing message. When you reply to or forward a message, the encryption state of your message matches the state of the incoming message rather than your system default setting. ![]() Select the account that has messages that you want to encrypt by default.Ĭhoose Account > Advanced > Encrypt by Default, then turn on Encrypt by Default. When you configure S/MIME for your account, you can choose to "Encrypt by Default" when you compose new messages: You also need the recipient's certificate (public key). You can get S/MIME certificates from a certificate authority (CA) or, if you're using an Exchange account, from your organization. To send encrypted messages, install an S/MIME certificate for your email account. IOS supports S/MIME so that you can send encrypted email messages. Use S/MIME to send and receive encrypted messages in the Mail app in iOS
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