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# When S/MIME Cannot Be Used

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Problem | Causes | Solutions
--- | --- | ---
If several destinations are selected for the broadcasting sequence, the data is sent over twice. | Encrypted e-mails are sent to the destinations for which S/MIME authentication is set, and plain text e-mails are sent to the destinations for which S/MIME authentication is not set. | Make sure S/MIME-authentication destinations are separate from plain text destinations. To encrypt e-mails, a user certificate must be installed in Address Book. For details about destination settings, see Security Guide.
When putting a signature on an e-mail using S/MIME, an e-mail address for "Sender" is not set for "From". | When S/MIME is applied, the administrator appears in the "From" field, and the sender appears in the "Reply-to" field. | For details about applying S/MIME, see Security Guide.

- Using S/MIME makes e-mail larger than when not using S/MIME.

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