d>class</td>
 <td>Class name that implements this protocol.</td>
 </tr>
 <tr>
 <td>vendor</td>
 <td>Optional string identifying the vendor.</td>
 </tr>
 <tr>
 <td>version</td>
 <td>Optional string identifying the version.</td>
 </tr>
 </table><p>

 Here's an example of <code>META-INF/javamail.default.providers</code>
 file contents:
 <pre>
 protocol=imap; type=store; class=com.sun.mail.imap.IMAPStore; vendor=Oracle;
 protocol=smtp; type=transport; class=com.sun.mail.smtp.SMTPTransport; vendor=Oracle;
 </pre