Security Settings to E-mails
Applying security (encryption and a signature) to e-mail helps prevent spoofing and information leakage.
The S/MIME is used to set security.
Applying security to e-mail may reduce transmission speed.
Sending Encrypted E-mail
Use the following procedure to specify a destination for which encryption is configured, and encrypt and send an e-mail.
Destinations for which encryption can be configured for each transmission are indicated by this symbol 
.
Destinations for which e-mails are always encrypted are indicated by this symbol 
. When you specify a destination denoted by the symbol, encrypted e-mail will be sent regardless of the setting specified in [Security].
Press [Security].
Press [Encryption].
Press [OK].
Encrypting e-mail will increase its size.
If you have selected multiple destinations including destinations for which encryption has not been configured, e-mail sent to such destinations will not be encrypted even if you specify encryption.
If you selected [Store to HDD
Send], the e-mail will be encrypted, but the stored file will not be encrypted. For details about encrypting stored files.
Sending E-mail with a Signature
Press [Security].
Press [Signature].
Press [OK].
The certificate (device certificate) installed on this machine is used to attach signatures.
If a certificate has expired while transferring e-mail from the server to a destination, the destination might not be able to receive the e-mail.
Note that the following can result if certain signature settings are specified by the administrator:
[Signature] does not appear. This is because you cannot apply signatures to scan files that are sent by e-mail.
You cannot change the [Signature] settings. This is because a signature is always applied to scan files that are sent by e-mail.