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/usr/share/courier/webadmin/admin-31esmtp.html is in courier-mta 0.66.1-1ubuntu4.

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The actual contents of the file can be viewed below.

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <meta name="MSSmartTagsPreventParsing" content="TRUE" />
  <meta name="Author" content="Sam Varshavchik" />
  <title>@PACKAGE@ @VERSION@ - Outbound ESMTP</title>
  <!--

  [#SAVED=<span style="color: #008000">Saved</span>#]
  [#BADDOMAIN=<span style="color: #ffff00">Error: invalid domain/IP address</span>#]
  [#DELETE=- delete#]

  [#SECONDS=seconds#]
  [#MINUTES=minutes#]
  [#HOURS=hours#]

  [#SECURE=<span style="color: #808000">(secure connection)</span>#]
  [#UNSECURE=<em>do not use STARTTLS</em>#]
  [#UP=Up#]
  [#DOWN=Down#]
  [#DEFAULTSMARTHOST=<em>default smarthost</em>#]
  [#DEFAULTMX=<em>use MX records</em>#]

  [#___#]
  -->
</head>

<body text="#000000" bgcolor="#ffffff" link="#0000ee" vlink="#0000ee"
alink="#ff0000">
<!-- Copyright 2001 Double Precision, Inc.  See COPYING for -->
<!-- distribution information. -->

<h1><tt>@PACKAGE@ @VERSION@</tt> - Outbound ESMTP</h1>
@ERROR@

<form method="post" action="31esmtp">

  <table cellspacing="16" cellpadding="0" border="0">
    <tbody>
      <tr>
        <td>Retry delay for unreachable domains:</td>
        <td>@ESMTPDELAY@ (default: 5 mins)</td>
      </tr>
      <tr>
        <td>Connection timeout:</td>
        <td>@ESMTPTIMEOUTCONNECT@ (default: 1 min)</td>
      </tr>
      <tr>
        <td>EHLO/HELO timeout:</td>
        <td>@ESMTPTIMEOUTHELO@ (default: 5 mins)</td>
      </tr>
      <tr>
        <td>HELO identification:</td>
        <td><input type="text" size="20" name="ESMTPHELO"
        value="@ESMTPHELO@" /></td>
      </tr>
      <tr>
        <td>Keep session alive after message the is sent:</td>
        <td>@ESMTPTIMEOUTKEEPALIVE@ (default: 1 min)</td>
      </tr>
      <tr>
        <td>Keep session busy by sending RSETs every:</td>
        <td>@ESMTPTIMEOUTKEEPALIVEPING@ (default: 0-disable)</td>
      </tr>
      <tr>
        <td>Timeout for the QUIT command:</td>
        <td>@ESMTPTIMEOUTQUIT@ (default: 5 seconds)</td>
      </tr>
    </tbody>
  </table>

  <input type="submit" value="Save" name="Save" /></form>

<h2>Smarthosting/routing</h2>

<div style="margin-left: 3.5em;">
  @ESMTPROUTES@</div>

<form method="post" action="31esmtp">

  <table>
    <tbody>
      <tr>
        <th valign="middle">Add:</th>
        <td valign="middle"><input type="radio" name="AddRoute"
          value="EXPLICIT" /> To:<input type="text" size="20" name="domain" /><br />
          <input type="radio" name="AddRoute" value="DEFAULT" /> Default
          smarthost</td>
        <td valign="middle">Route via:</td>
        <td valign="middle">
          <table border="0" cellpadding="0" cellspacing="0">
            <tbody>
              <tr>
                <td valign="middle">Domain: </td>
                <td> </td>
                <td valign="middle"><input type="text" size="20"
                  name="routedomain" /></td>
                <td> </td>
              </tr>
              <tr>
                <td colspan="4"> </td>
              </tr>
              <tr>
                <td valign="middle">IP: </td>
                <td valign="middle">[</td>
                <td valign="middle" width="1"><input type="text" size="20"
                  name="routeip" /></td>
                <td valign="middle">]</td>
              </tr>
            </tbody>
          </table>
        </td>
        <td valign="middle">Port: <input type="text" size="3"
        name="port" /></td>
        <td valign="middle"><input type="checkbox"
          name="SECURITYSTARTTLS" /> Use a <a target="_blank"
          href="http://www.courier-mta.org/install.html#esmtpsecurity">secure
          connection</a>. <br />
          <input type="checkbox" name="SECURITYNONE" /> Do not use STARTTLS for
          this destination.</td>
      </tr>
      <tr>
        <td colspan="3"> </td>
        <td align="right">(default: use MX records)</td>
        <td colspan="2"> </td>
      </tr>
    </tbody>
  </table>

  <input type="submit" value="Save" name="Save" /></form>
<hr />

<p><a href="@MAINMENU@">Main Menu</a></p>
</body>
</html>