Use the following procedure to apply a signature to an e-mail that has scan file attachments.
The certificate (device certificate) installed on this machine is used to attach signatures.
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.