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Telnet POP3 example:

POP3 Check Port 110 with the Telnet Command

You can check your POP3 Server on port 110 with the following Telnet command:

Open a command line and type

telnet pop3-server.domain.com 110

You can also do this with PuTTY. Check the "Telnet" radio button and type 110 instead of 23 in the "Port" textbox.
If your server is online a connection will be established on port 110 (POP3). An Exchange Server 2016 answers with the following output:

+OK The Microsoft Exchange POP3 service is ready.

Use the following commands for authentication and for listing the messages:

USER <domain\username>
PASS <password>
+OK User successfully logged on.  
1 6855
2 1483
3 1056
4 1841
5 2037

A list of messages is displayed. If you would like to read message number 2, use the following command:

Received: by exchange.domain.com

id <01C44FA6.6E523331@exchange.domain.com>; Fri, 05 Jan 2018 13:22:50 +0200
Content-Class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: text/html;
Content-Transfer-Encoding: quoted-printable
Subject: Test-Message
X-MimeOLE: Produced By Microsoft Exchange V6.0.6375.0
Fri, 05 Jan 2018 13:22:50 +0200
Message-ID: <8440D3CEE802234F9C2F1AA01BE6D26C012B59C2@exchange.domain.com>
Thread-Topic: Test-Message
Thread-Index: AcRPpm5PwHwq3LOMRY2RBQeho6HObw==
From: "User1" <user1@domain.com>
To: "User2" <user2@domain.com>

<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = charset=3DUS-ASCII">
<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version = 6.0.6389.0">
<TITLE>Test-Message </TITLE>
<!-- Converted from text/rtf format -->
<P><FONT SIZE=3D2 FACE=3D"Arial">Test-Message </FONT>

The better way to Check Port 110 (free tool)

If you would like to check your POP3 Server at regular intervals, you can use the command line utility SLCheck. SLCheck connects to the POP3 Server and checks the answer. Batch files can be executed in dependance of the result, e.g. to send alarm notifications. Try the following command:

SLCheck -p 110 -a pop3.domain.com -r "+OK"

+OK is the normal answer from a POP3 Server.

All results are logged in a logfile. You can monitor your POP3 Server by running SLCheck as a scheduled task, e.g. once a minute.

There's another article about the Telnet SMTP commands on this website.

PingTool is the perfect tool if you need a Ping GUI. It permanently shows the status of network devices. PortCheck is a TCP port checker for Windows 11. It checks the availability of remote TCP ports. If you need a free Wake On Lan Tool, you can use WakeOnLanTool.

SLCheck Homepage