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Testing POP3 and SMTP Server Mail Server Using Telnet

Last modified: March 15, 2021
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Testing POP3 and SMTP Server Mail Server Using Telnet

1. Start > Run > cmd (WinNT/XP/2003) or Start > Run > command (Win95/98)

2. Type command:telnet mail.domainname.com 25 (Example as below)

c:\telnet mail.YourDomain.com 25Connecting To mail.YourDomain.com…_

You should receive some response as below:

220- domainname.com ESMTP Exim 4.50 #1 Tue, 21 Jun 2005 07:30:42 +0800
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.

The message confirmed that the SMTP server is working properly.

3. To quit the Telnet prompt, type “quit”.

To confirm the POP server is online and responding:

1.Start > Run > cmd (WinNT/XP/2003) orStart > Run > command (Win95/98)

2.telnet mail.domainname.com 110 (Example as below)

c:\telnet mail.YourDomain.com 110Connecting To mail.YourDomain.com…_

You should receive some response as below:

+OK POP3 HostName [cppop x.x] at [192.168.1.7] (domainname.com)

The message confirmed that the POP server is working properly.

3. To quit the Telnet prompt, type “quit”

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