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Editorial Team
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Asked: 2026-06-09T22:10:23+00:00

I have a SMTP-server, for the purpose of this question lets call it: smtp.mydomain.example

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I have a SMTP-server, for the purpose of this question lets call it: smtp.mydomain.example.

How do I check if the SMTP-server is in working? Can I send emails manually from Linux commandline?

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  1. Editorial Team

    Syntax for establishing a raw network connection using telnet is this:

    telnet {domain_name} {port_number}

    So telnet to your SMTP server like

    telnet smtp.mydomain.example 25

    And copy and paste the below

    helo client.mydomain.example
mail from:<sender@mydomain.example>
rcpt to:<to_email@mydomain.example>
data
From: test@mydomain.example
Subject: test mail from command line

this is test number 1
sent from linux box
.
quit

    Note : Do not forgot the "." at the end which represents the end of the message.
    The "quit" line exits ends the session.

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