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Bulrush
Asked: 2016-01-29 06:49:17 +0800 CST

How to see if email daemon is running on another server?

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I have a server with Ubuntu 14.04LTS. I am sending email from Ubuntu to email.test.com and then to my Windows PC account with Outlook, but I changed the domain for this post to test.com. The email sends and I have no errors in my SMTP log but the emails are not getting to my PC account.

I can ping email.test.com but that only tells me the physical machine is running. How can I tell if the email server is running if there are no errors in my SMTP log?

Thank you.

server

1 Answers

  1. There are 2 ways to see if an email server is running.

    First (read man nmap), and do: 

    nmap -sT -p25 --version-all email.test.com

    Or use telnet (of course, read `man

    telnet`), and do:

    telnet email.test.com 25

    In both cases, the "25" specifies the traditional TCP port that email servers listen to.

    $ grep smtp /etc/services
smtp        25/tcp      mai

    l

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