How to check if smtp is working from commandline Linux

Question

I have a SMTP-server  for the purpose of this question lets call it  smtp mydomain com   How do i check if the SMTP-server is in working  Can I send emails manually from Linux commandline

User · Answer

The only thing about using telnet to test postfix, or other SMTP, is that you have to know the commands and syntax. Instead, just use swaks :)

thufir@dur:~$ 
thufir@dur:~$ mail -f Maildir
"/home/thufir/Maildir": 4 messages
>    1 [email protected]                   15/553   test Mon, 30 Dec 2013 10:15:12 -0800
     2 [email protected]                   15/581   test Mon, 30 Dec 2013 10:15:55 -0800
     3 [email protected]                   15/581   test Mon, 30 Dec 2013 10:29:57 -0800
     4 [email protected]                   15/581   test Mon, 30 Dec 2013 11:54:16 -0800
? q
Held 4 messages in /home/thufir/Maildir
thufir@dur:~$ 
thufir@dur:~$ swaks --to [email protected]
=== Trying dur.bounceme.net:25...
=== Connected to dur.bounceme.net.
<-  220 dur.bounceme.net ESMTP Postfix (Ubuntu)
 -> EHLO dur.bounceme.net
<-  250-dur.bounceme.net
<-  250-PIPELINING
<-  250-SIZE 10240000
<-  250-VRFY
<-  250-ETRN
<-  250-STARTTLS
<-  250-ENHANCEDSTATUSCODES
<-  250-8BITMIME
<-  250 DSN
 -> MAIL FROM:<[email protected]>
<-  250 2.1.0 Ok
 -> RCPT TO:<[email protected]>
<-  250 2.1.5 Ok
 -> DATA
<-  354 End data with <CR><LF>.<CR><LF>
 -> Date: Mon, 30 Dec 2013 14:33:17 -0800
 -> To: [email protected]
 -> From: [email protected]
 -> Subject: test Mon, 30 Dec 2013 14:33:17 -0800
 -> X-Mailer: swaks v20130209.0 jetmore.org/john/code/swaks/
 -> 
 -> This is a test mailing
 -> 
 -> .
<-  250 2.0.0 Ok: queued as 52D162C3EFF
 -> QUIT
<-  221 2.0.0 Bye
=== Connection closed with remote host.
thufir@dur:~$ 
thufir@dur:~$ mail -f Maildir
"/home/thufir/Maildir": 5 messages 1 new
     1 [email protected]                   15/553   test Mon, 30 Dec 2013 10:15:12 -0800
     2 [email protected]                   15/581   test Mon, 30 Dec 2013 10:15:55 -0800
     3 [email protected]                   15/581   test Mon, 30 Dec 2013 10:29:57 -0800
     4 [email protected]                   15/581   test Mon, 30 Dec 2013 11:54:16 -0800
>N   5 [email protected]                   15/581   test Mon, 30 Dec 2013 14:33:17 -0800
? 5
Return-Path: <[email protected]>
X-Original-To: [email protected]
Delivered-To: [email protected]
Received: from dur.bounceme.net (localhost [127.0.0.1])
    by dur.bounceme.net (Postfix) with ESMTP id 52D162C3EFF
    for <[email protected]>; Mon, 30 Dec 2013 14:33:17 -0800 (PST)
Date: Mon, 30 Dec 2013 14:33:17 -0800
To: [email protected]
From: [email protected]
Subject: test Mon, 30 Dec 2013 14:33:17 -0800
X-Mailer: swaks v20130209.0 jetmore.org/john/code/swaks/
Message-Id: <[email protected]>

This is a test mailing

New mail has arrived.
? q
Held 5 messages in /home/thufir/Maildir
thufir@dur:~$

It's just one easy command.

User · Answer

root piwik-dev tmp   mail -v root localhost Subject  Test Hello world Cc    lt Ctrl D gt   root localhost    Connecting to  127 0 0 1  via relay    220 piwik-dev example com ESMTP Sendmail 8 13 8 8 13 8  Thu  23 Aug 2012 10 49 40 -0400  gt  gt  gt  EHLO piwik-dev example com 250-piwik-dev example com Hello localhost localdomain  127 0 0 1   pleased to meet you 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-8BITMIME 250-SIZE 250-DSN 250-ETRN 250-DELIVERBY 250 HELP  gt  gt  gt  MAIL From  lt root piwik-dev example com gt  SIZE 46 250 2 1 0  lt root piwik-dev example com gt     Sender ok  gt  gt  gt  RCPT To  lt root piwik-dev example com gt   gt  gt  gt  DATA 250 2 1 5  lt root piwik-dev example com gt     Recipient ok 354 Enter mail  end with     on a line by itself  gt  gt  gt    250 2 0 0 q7NEneju002633 Message accepted for delivery root localhost    Sent  q7NEneju002633 Message accepted for delivery  Closing connection to  127 0 0 1   gt  gt  gt  QUIT 221 2 0 0 piwik-dev example com closing connection

User · Answer

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 com 25   And copy and paste the below  helo client mydomain com mail from  lt sender mydomain com gt  rcpt to  lt to email mydomain com gt  data From  test mydomain com 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

User · Answer

Not sure if this help or not but this is a command line tool which let you simply send test mails from a SMTP server priodically  http   code google com p woodpecker-tester

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