reword POP documentation, add to changelog/readme

CHANGELOG.md

@@ -15,6 +15,7 @@ Control panel:
 * Explanatory text for setting up secondary nameserver is added/fixed.
 * DNS checks now have a timeout in case a DNS server is not responding, so the checks don't stall indefinitely.
 * Better messages if external DNS is used and, weirdly, custom secondary nameservers are set.
+* Add POP to the mail client settings documentation.
 
 System:
 

management/templates/mail-guide.html

@@ -29,7 +29,7 @@
 					<tr><th>Protocol/Method</th> <td>IMAP</td></tr>
 					<tr><th>Mail server</th> <td>{{hostname}}</td>
 					<tr><th>IMAP Port</th> <td>993</td></tr>
-					<tr><th>IMAP Security</th> <td>SSL</td></tr>
+					<tr><th>IMAP Security</th> <td>SSL or TLS</td></tr>
 					<tr><th>SMTP Port</th> <td>587</td></tr>
 					<tr><th>SMTP Security</td> <td>STARTTLS <small>(&ldquo;always&rdquo; or &ldquo;required&rdquo;, if prompted)</small></td></tr>
 					<tr><th>Username:</th> <td>Your whole email address.</td></tr>
@@ -37,7 +37,8 @@
 					</table>
 
 					<p>In addition to setting up your email, you&rsquo;ll also need to set up <a href="#sync_guide" onclick="return show_panel(this);">contacts and calendar synchronization</a> separately.</p>
-					<p>As an alternative to IMAP you can also use the POP protocol. For this you just need to pick POP as the protocol in your e-mail client, and use the port 995. The SMTP settings and usernames and passwords remain the same. However, we strongly recommend to use IMAP or ActiveSync.</p>
+
+					<p>As an alternative to IMAP you can also use the POP protocol: choose POP as the protocol, port 995, and SSL or TLS security in your mail client. The SMTP settings and usernames and passwords remain the same. However, we recommend you use IMAP instead.</p>
 
 				<h4>Exchange/ActiveSync settings</h4>