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    To confirm what Keith says,<br>
    You want IMAP if you are trying to use it for ZendTo authentication,
    but as you've got an Exchange server you've almost certainly got
    Active Directory running and so should use that for ZendTo
    authentication.<br>
    If you are using it to send email, you want SMTP not IMAP. IMAP does
    not (and cannot) send email. IMAP is for reading mail (i.e. the
    content of mailboxes).<br>
    <br>
    Cheers,<br>
    Jules.<br>
    <div class="moz-cite-prefix">On 07/08/2018 14:11, Keith Erekson via
      ZendTo wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:WM!a65c82e6d9cf6d8d5ea447274ac353856f0cc3e2069f2ab825cc14159a61ba5d957984051f50e72051e20eb4d16e43e5!@mx.jul.es">
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      <div>You want SMTP, not IMAP.<br>
        <br>
      </div>
      <div id="AppleMailSignature">~Keith</div>
      <div><br>
        On Aug 7, 2018, at 8:11 AM, Marcel de Leeuw via ZendTo <<a
          href="mailto:zendto@zend.to" moz-do-not-send="true">zendto@zend.to</a>>
        wrote:<br>
        <br>
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          <p>Hi there,</p>
          <p><br>
          </p>
          <p>Our Exchange system engineer says IMAP is enabled on our
            on-prem Exchange cluster. A test with Mozilla Thunderbird
            confirms this. I've opened both the secure and the unsecure
            IMAP port in our firewall from the ZendTo host in our DMZ to
            one of our Exchange cluster member servers. Telnet from the
            ZendTo host to the Exchange cluster member gives a hopeful
            response. I've fiddled with numerous configurations in
            preference.php but can't get it to work. Anyone any good
            suggestions or a comprehensive guide?<br>
          </p>
          <p><br>
          </p>
          <div id="Signature">
            <div name="divtagdefaultwrapper"
              style="font-family:Calibri,Arial,Helvetica,sans-serif;
              font-size:; margin:0">
              <span style=""><span style="font-size:11.0pt;
                  font-family:"Arial","sans-serif";
                  color:#1F497D">Kind regards</span></span><span
                style=""><span style="font-size:11.0pt;
                  font-family:"Arial","sans-serif";
                  color:#1F497D"><br>
                  Marcel de Leeuw<br>
                </span></span><span style=""><span
                  style="font-size:11.0pt;
                  font-family:"Arial","sans-serif";
                  color:#1F497D">Vakspecialist B, SO<br>
                </span></span><span style=""><span
                  style="font-size:11.0pt;
                  font-family:"Arial","sans-serif";
                  color:#1F497D">Team ICT Beleid en Beheer<br>
                </span></span><span style=""><span
                  style="font-size:11.0pt;
                  font-family:"Arial","sans-serif";
                  color:#1F497D">Gemeente Schiedam<br>
                </span></span><span style=""><span
                  style="font-size:11.0pt;
                  font-family:"Arial","sans-serif";
                  color:#1F497D">Tel:</span></span><a tabindex="0"
                href="tel:+31%2010%20219%201156" id="NoLP"
                moz-do-not-send="true"><span style=""><span
                    style="font-size:11.0pt;
                    font-family:"Arial","sans-serif";
                    color:blue">+31 10 2191156</span></span></a></div>
          </div>
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      <blockquote type="cite">
        <div><span>_______________________________________________</span><br>
          <span>ZendTo mailing list</span><br>
          <span><a href="mailto:ZendTo@zend.to" moz-do-not-send="true">ZendTo@zend.to</a></span><br>
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              moz-do-not-send="true">http://jul.es/mailman/listinfo/zendto</a></span><br>
        </div>
      </blockquote>
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      <br>
      <pre wrap="">_______________________________________________
ZendTo mailing list
<a class="moz-txt-link-abbreviated" href="mailto:ZendTo@zend.to">ZendTo@zend.to</a>
<a class="moz-txt-link-freetext" href="http://jul.es/mailman/listinfo/zendto">http://jul.es/mailman/listinfo/zendto</a>
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    <br>
    <pre class="moz-signature" cols="72">Jules

-- 
Julian Field MEng CEng CITP MBCS MIEEE MACM

'The best and most beautiful things in life cannot be seen or even
 touched; they must be felt with the heart.' - Helen Keller

<a class="moz-txt-link-abbreviated" href="http://www.Zend.To">www.Zend.To</a>
Twitter: @JulesFM
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