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Returned mail... am i relaying? aaugh!

does this [see attachment] indicate that some spammer has found
a way to get me to relay his mail? aaugh!

this looks bad. i have serensoft.com running in my basement on a
woody (and freshly-upgraded 2.4.20-k6 kernel) and i allow pop3
and smtp connections for my serensoft mail users.

passwords are in-the-clear there, of course; but with restricted
shells (/bin/false) there's not much danger, is there?

still, if you look at the attached bounce, it looks like somehow
a spammer is trying to use my exim (or worse, IS using my exim)
to relay/forward his junk.

i did `zgrep zimmerman /var/log/exim/mainlog*` and came up
empty. and since it says it arrived on '26 Jan 2003 23:51:44'
i also looked for ':51:44' (thinking maybe the time zone might
affect the log entry, i looked for minutes:seconds) and found
nothing. same for '211.144.100.21', the incoming ip address.

paniclog and rejectlog are empty...

where should i look? what should i look for?

-- 
I use Debian/GNU Linux version 3.0;
Linux server 2.4.20-k6 #1 Mon Jan 13 23:49:14 EST 2003 i586 unknown
 
DEBIAN NEWBIE TIP #104 from Sean Quinlan <smq@gmx.co.uk>
:
Looking to CUSTOMIZE THE COLORS USED BY LS?  I find its easier
to run "dircolors -p >~/.dircolors" and then add "eval
`dircolors -b ~/.dircolors`" to my .bashrc and then make all
changes to ~/.dircolors (instead of the system-wide
/etc/DIR_COLORS).  Probably more pertinent on a multi user
system, but good policy nevertheless.

Also see http://newbieDoc.sourceForge.net/ ...
--- Begin Message --- 
The original message was received at Sun, 26 Jan 2003 23:51:44 -0500 (EST)
from [211.144.100.21]

   ----- The following addresses had permanent fatal errors -----
<william.zimmerman@lexisnexis.com>
    (reason: 550 5.1.1 <william.zimmerman@[138.12.44.45]>... User unknown)
    (expanded from: <william.zimmerman@lexisnexis.com>)

   ----- Transcript of session follows -----
... while talking to [138.12.44.45]:
>>> RCPT To:<william.zimmerman@[138.12.44.45]>
<<< 550 5.1.1 <william.zimmerman@[138.12.44.45]>... User unknown
550 5.1.1 <william.zimmerman@lexisnexis.com>... User unknown

Reporting-MTA: dns; lexis-nexis.com
Received-From-MTA: DNS; [211.144.100.21]
Arrival-Date: Sun, 26 Jan 2003 23:51:44 -0500 (EST)

Final-Recipient: RFC822; <william.zimmerman@lexisnexis.com>
X-Actual-Recipient: RFC822; william.zimmerman@[138.12.44.45]
Action: failed
Status: 5.1.1
Remote-MTA: DNS; [138.12.44.45]
Diagnostic-Code: SMTP; 550 5.1.1 <william.zimmerman@[138.12.44.45]>... User unknown
Last-Attempt-Date: Sun, 26 Jan 2003 23:51:49 -0500 (EST)
--- Begin Message ---
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