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Telnet POP3:

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

If your server is online a connection will be established on port 110 (POP3). An Exchange Server answers with the following output:

+OK Microsoft Exchange 2000 POP3 server version 6.0.6249.0 (exchange-server.domain.com) ready.

Use the following commands for authentication and listing the messages:

USER Domain/Windows-NT-Account/Exchange-Mailbox
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, 11 Jun 2004 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
Date: Fri, 11 Jun 2004 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.

SLCheck Homepage