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version 1.55, 2016/08/15 23:16:08 version 1.56, 2016/08/16 02:13:38
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 <li>OpenSMTPD 5.9.1  <li>OpenSMTPD 6.0.0
     <ul>      <ul>
     <li>...        <li>Security:
           <ul>
           <li>Implement the fork+exec pattern in
               <a href="http://man.openbsd.org/smtpd">smtpd(8)</a>.
           <li>Fix a logic issue in the SMTP state machine that can lead to
               an invalid state and result in a crash.
           <li>Plug a file-pointer leak that can lead to resource exhaustion
               and result in a crash.
           <li>Use automatic DH parameters instead of fixed ones.
           <li>Disable DHE by default since it is computationally expensive
               and a potential DoS vector.
           </ul>
         <li>The following improvements were brought in this release:
           <ul>
           <li>Add the <tt>-r</tt> option to the
               <a href="http://man.openbsd.org/smtpd">smtpd(8)</a>
               enqueuer for compatibility with mailx.
           <li>Explicitly enclose SMTP transactions between BEGIN and
               COMMIT/ROLLBACK filter events.
           <li>Add missing date or message-id when listening on the submit
               port.
           <li>Fix "smtpctl show queue" reporting "invalid" envelope state.
           <li>Rework the format of the "Received" header so that the TLS
               part does not violate the RFC.
           <li>Increase the number of connections a local address is
               allowed to establish, and decrease the delay between
               transactions in the same session.
           <li>Properly reset the transaction when a filter rejects a
               message.
           <li>Deal with LMTP servers returning continuation lines.
           </ul>
     </ul>      </ul>
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