Information Technology Reference
In-Depth Information
When you open a signed or encrypted message, Mail displays an extra Security header (be-
neath the To header). Figure 19 shows this header as it appears for a message that's both
signed and encrypted.
Figure 19: When a message has been signed or encrypted, a Security
header appears below the To header.
When you receive a signed message, Mail automatically adds the sender's certificate to your
keychain. If you want to view the certificate info from within Mail, click the checkmark icon
in the header; a dialog appears with the relevant information ( Figure 20 ).
Figure 20: Click the checkmark icon in the message header to show the
certificate, just like this.
In general, that's all you need to know—you need not jump through any additional hoops to
decrypt messages or verify senders. If a message arrives that Mail is unable to decrypt (for ex-
ample, because your private key doesn't match the public key the sender used), a yellow ban-
ner appears at the top of the message that says “Unable to decrypt message.” Click the Show
Details button to see (often sketchy and unhelpful) information about why Mail couldn't de-
crypt it.
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