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From: John Nielsen <lists@jnielsen.net>
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Date: Mon, 22 May 2006 10:07:52 -0400
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Cc: Imran Imtiaz <imran@darkstar.thelakecity.com.pk>
Subject: Re: what does this mean
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On Sunday 21 May 2006 05:19, Imran Imtiaz wrote:
> i've seen the following log in my messages can any body tell me what does
> it mean?
>
> May 21 02:50:29 darkstar sm-mta[55021]: k4KLoTeq055021: localhost
> [127.0.0.1] did not issue MAIL/EXPN/VRFY/ETRN during connection to MSA

It means that someone (probably you or a program you were running since it's 
from localhost) connected to sendmail (probably on TCP port 25) on your 
machine, but then disconnected before issuing any commands.  You can generate 
the message again by doing "telnet localhost 25" and then typing ^] and quit 
without typing anything over the connection.

Probably the result of a port scan or connectivity check.  I wouldn't worry 
about it unduly.

JN