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Smith Dwayne
Asked: 2016-11-02 05:47:39 +0800 CST

How to check postfix server using telnet

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I have postfix email server on Ubuntu 11.04 version. I upgraded installed packages using the following command

sudo aptitude update && sudo aptitude safe-upgrade

Once I update those packages, I couldn't connect my email from my client machine. So I tested my postfix server using telnet.

telnet mail.mydomain.com 25

I got the following result for the above command.

Trying 127.0.0.1...
Connected to mail.mydomain.com.
Escape character is '^]'.

I am very new to this postfix server. I couldn't understand whether my postfix server corrupted or not? Why I couldn't connect my email after updating the packages?

ubuntu postfix telnet aptitude

1 Answers

  1. Google "check email server using telnet" no quotes

    Some of your output may vary but if you do not get any errors and you receive the email from the email server you can know that emial is flowing properly.

    Also im not 100% sure if this answers your qestion however this is the way the check your email server form command line.

    Also when using telnet be careful as 1 typo means you have start all over again.

    From the port25 website

    Here are all the commands I have bolded the command you will need to type out vs the output you will see.

    telnet mail.port25.com 25

    Trying 69.63.149.30...

    Connected to mail.port25.com (69.63.149.30).

    Escape character is '^]'.

    220 mail.port25.com (PowerMTA(TM) v4.0) ESMTP service ready

    EHLO server.example.com

    250-mail.port25.com says hello

    250-STARTTLS

    250-ENHANCEDSTATUSCODES

    250-PIPELINING

    250-CHUNKING

    250-8BITMIME

    250-XACK

    250-XMRG

    250-SIZE 54525952

    250-VERP

    250 DSN

    MAIL FROM: <[email protected]>

    250 2.1.0 MAIL ok

    RCPT TO: <[email protected]>

    250 2.1.5 <[email protected]> ok

    DATA

    354 send message

    From: "John Smith" <[email protected]>

    To: "Jane Doe" <[email protected]>

    Subject: test message sent from manual telnet session

    Hello World,

    .

    250 2.6.0 message received

    QUIT

    221 2.0.0 mail.port25.com says goodbye

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