setup/04-port-forwarding.md

 ---
 title: 4. Port Forwarding
 ---
+
 # Port Forwarding
 
 **This is an optional step, but required if you want to use Thunderbird.**
@@ -9,7 +10,38 @@ There are a number of ways you can access the mail within your NNCPNET node.  Pe
 
 Edit your run.sh and add a new line right after the `docker run` line, like so:
 
-`-p 127.0.0.1:20025:25 -p 127.0.0.1:20143:142 \`
+`-p 127.0.0.1:20025:25 -p 127.0.0.1:20143:143 \`
 
 Now rerun `./run.sh`.
 
+At this point, from your host system, you should be able to do something like this:
+
+```
+$ telnet localhost 20025
+Trying ::1...
+Connection failed: Connection refused
+Trying 127.0.0.1...
+Connected to localhost.
+Escape character is '^]'.
+220 examplenode.nncpnet.org ESMTP Exim 4.96 Thu, 03 Apr 2025 00:51:53 +0000
+```
+
+and
+
+```
+$ telnet localhost 20143
+Trying ::1...
+Connection failed: Connection refused
+Trying 127.0.0.1...
+Connected to localhost.
+Escape character is '^]'.
+* OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ STARTTLS LOGINDISABLED] Dovecot (Debian) ready.
+```
+
+OK, IMAP and SMTP are working.
+
+Note that IMAP is authenticated, but SMTP -- barring additional configuration -- is not.
+
+# Next
+
+Proceed to [Thunderbird](setup/05-thunderbird).
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