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--- a/help/C/usage-mail.xml
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@@ -1615,6 +1615,69 @@ action="simul"><keycap>Ctrl</keycap><keycap>F</keycap></keycombo>. If
</para>
</tip>
+ <sect2 id="encryption-smime">
+ <title>S/MIME Encryption</title>
+ <para>
+ S/MIME encrpytion uses a key-based approach as well, but it
+ has some significant advantages in convenience and
+ security. S/MIME uses "certificates," which are basically
+ the same as keys. The public portion of each certificate is
+ held by the sender of a message and by one of several
+ certificate authorities, who are paid to guarantee the
+ identity of the sender and the security of the
+ message. Evolution already knows a large number of
+ certificate authorities, so when you get a message with an
+ S/MIME certificate, your system will automatically get the
+ public portion of the certificate and decrypt or verify the
+ message.
+ </para>
+ <para>
+ S/MIME is used most often in corporate settings. In these
+ cases, administrators supply certificates which they have
+ purchased from a certificate authority. In some cases, an
+ organization can act as its own certificate authority, with
+ or without a guarantee from a dedicated authority such as
+ Verisign or Thawte. In either case, the system administrator
+ will provide you with a certificate file.
+ </para>
+ <para>
+ If you wish to use S/MIME independently, you can extract an
+ identification certificate from your Mozilla or Netscape web
+ browser. See the Mozilla help for more information on
+ security certificates.
+ </para>
+
+ <para>
+ The certificate file is a password-protected file on your
+ computer. To use it in Evolution, select <menuchoice><guimenu>Tools</guimenu>
+ <guimenuitem>Settings</guimenuitem></menuchoice> and select
+ the <guilabel>Certificates</guilabel> tool in the settings
+ window. Click the <guilabel>Import</guilabel> button and
+ select the file when prompted.
+ </para>
+ <para>
+ Similarly, you can add certificates which are sent to you
+ independently of any authority by clicking the
+ <guilabel>Contact Certificates</guilabel> tab and using the
+ same <guilabel>Import</guilabel> tool. You can also add new
+ certificate authorities, which have their own certificate
+ files, in the same way.
+ </para>
+ <para>
+ Once you have added your certificate, you can sign or encrypt a message by selecting <menuchoice>
+ <guimenu>Security</guimenu> <guimenuitem>S/MIME
+ Sign</guimenuitem></menuchoice> or <guimenuitem>S/MIME
+ Encrypt</guimenuitem> in the message composer. To have every
+ message signed or encrypted, select an email account in the Settings dialog (<menuchoice>
+ <guimenu>Tools</guimenu>
+ <guimenuitem>Settings</guimenuitem></menuchoice> and, under the
+ <guilabel>Security</guilabel> tab, check the appropriate
+ box. You can also import certificates in the per-account
+ security settings dialog.
+ </para>
+
+ </sect2>
+
<sect2 id="encryption-keygen">
<title>Making Encryption Keys</title>
<para>