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Wednesday·24·November·2010

Useful but Unknown Unix Tools: Swiss Army Knife for SMTP //at 01:04 //by abe

from the forget-telnet-on-port-25 dept.

Which mail server administrator hasn’t tested his servers using telnet on port 25, speaking SMTP himself? And which of them made a typo and had to retype everything due to missing readline support of telnet? If you want to check SMTP over SSL aka SMTPS, you had to use “openssl s_client -connect yourserver:465”. And what did you use to check TLS support on port 25?

Just forget about those hassles and use swaks (Debian package), the Swiss Army Knife for SMTP. It does all the annoying stuff (using the correct syntax, typing fast enough, SSL, TLS, etc.) for you while still giving you full control over the SMTP session, especially showing you all input and output:

$ swaks -t abe@noone.org -s sym.noone.org -q RCPT
=== Trying sym.noone.org:25...
=== Connected to sym.noone.org.
<-  220 sym.noone.org ESMTP Postfix (Debian/GNU)
 -> EHLO nemo.deuxchevaux.org
<-  250-sym.noone.org
<-  250-PIPELINING
<-  250-SIZE 10240000
<-  250-ENHANCEDSTATUSCODES
<-  250 8BITMIME
 -> MAIL FROM:<abe@nemo.deuxchevaux.org>
<-  250 2.1.0 Ok
 -> RCPT TO:<abe@noone.org>
<** 450 4.2.0 <abe@nemo.deuxchevaux.org>: Sender address rejected: Greylisted, see http://postgrey.schweikert.ch/help/noone.org.html
 -> QUIT
<-  221 2.0.0 Bye
=== Connection closed with remote host.

Since the moment I discovered swaks, I never telnetted to port 25 anymore.

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Debian GNU/Linux is my favourite Linux distribution, being stable, flexible, consistent and having a great community. Although I'm not the biggest bug report writer, I try to contribute by staffing the Debian booth at events, carrying the necessary hardware there or even organising the whole booth.


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